What is the UDP port number used by the BFD echo message?
- A . 3785
- B . 3786
- C . 3787
- D . 3788
The multicast IP address is 229.130.130.1, which of the following is its corresponding multicast MAC address?
- A . 00-00-5E-02-82-01
- B . 01-00-5E-02-82-01
- C . 00-00-5E-82-82-01
- D . 01-00-5E-82-82-01
Regarding the stpmcheck command in spanning tree configuration, which of the following are the correct statements?
- A . This command is used when RSTP switches and MSTP switches are interconnected.
- B . This command is used when switches from different manufacturers are interconnected and MSTP is running to check summary information.
- C . This command is used when the switch port running RSTP or MSTP is connected to the STP device.
- D . By running this command on a port of an RSTP or MSTP switch, you can switch the spanning tree mode of the port to STP.
In the switching network shown in the figure, all three switches have only the default VLAN 1. The interconnected ports of the three switches are all Trunks, and all VLANs are allowed to pass. The global and port GVRP functions are enabled on the three switches. VLAN 10 is created on the switch SWA, VLAN 20 is created on the switch SWC, and the GVRP registration mode of the Ethernet 1/0/1 port on the switch SWA is set to Fixed. Check the status information of each Trunk port on the three switches. Which of the following is correct?
- A . [SWA] display interface Ethernet 1/0/1 Ethernet1/0/1 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 (sec)Port link-type: trunk
VLAN passing: 1 (default vlan), 10, 20
VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q - B . [SWB] display interface Ethernet 1/0/1 Ethernet1/0/1 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 （ sec ） Port link-type: trunk
VLAN passing: 1 （ default vlan ）， 10 ， 20
VLAN permitted: 1 （ default vlan ）， 2-4094 Trunk port encapsulation: IEEE 802.1q - C . [SWB] display interface Ethernet 1/0/2 Ethernet1/0/2 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 （ sec ） Port link-type: trunk
VLAN passing: 1 （ default vlan ）， 10 ， 20
VLAN permitted: 1 （ default vlan ）， 2-4094 Trunk port encapsulation: IEEE 802.1q - D . [SWC] display interface Ethernet 1/0/1 Ethernet1/0/1 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 (sec)Port link-type: trunk
VLAN passing: 1 (default vlan), 10, 20
VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q
In the network shown in the figure, the corresponding configuration is completed on the switch SWA, and the switch SWA and each PC have learned the corresponding ARP table entry. When PCA accesses PCB, it sends an ICMP request message. Which of the following is the destination IP address of the message?
- A . 10.1.1.1
- B . 10.1.1.2
- C . 20.1.1.1
- D . 20.1.1.2
The customer LAN switches SWA, SWB, and SWC form the RRPP ring main ring 1. The switch SWA has the following configuration information:
[SWA] rrpp domain 1
[SWA-rrpp-domain1] control-vlan 4092
If switches SWB, SWC, and SWD form sub-ring 2, switches SWB, SWC, and SWE form sub-ring 3, which of the following can be known from the above information?
- A . Switches SWB, SWC, and SWD can use VLAN 4092 as the sub-ring 2 control VLAN
- B . Switches SWB, SWC, and SWE cannot use VLAN 4092 as the sub-ring 3 control VLAN
- C . The control VLAN of sub-ring 2 must be different from the control VLAN of sub-ring 3.
- D . To facilitate the management of the main ring, you can configure an IP management address on the sub-ring 3 control VLAN
In the switching network shown in the figure, VLAN 10 is set as Super VLAN on switch SWA, VLAN2 and VLAN3 are sub VLANs of VLAN 10, port Ethernet1/0/3 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass; VLAN2~VLAN20 are created on switch SWB. Port Ethernet/0/4 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?
- A . The PCC message comes out of SWB’s Ethernet 1/0/4 port and enters SWA’s Ethernet 1/0/3 port. The VLAN tag it carries is VLAN 1.
- B . The PCC message comes out of SWB’s Ethernet 1/0/4 port and enters SWA’s Ethernet 1/0/3 port. The VLAN tag it carries is VLAN 2.
- C . The PCC message comes out of SWB’s Ethernet 1/0/4 port and enters SWA’s Ethernet 1/0/3 port. The VLAN tag it carries is VLAN 3.
- D . The PCC message comes out of SWB’s Ethernet 1/0/4 port and enters SWA’s Ethernet 1/0/3 port. The VLAN tag it carries is VLAN 10.
The figure shows the networking application of RRPP. The customer LAN switches SWA, SWB, SWC, and SWD form the RRPP ring main ring 1, and the switches SWB, SWC, and SWE form the sub-ring 2.
If the switching SWE is the master node of sub-ring 2, which of the following can be known from the above information?
- A . If the link between switch SWA and switch SWB is down, switch SWE will release the secondary port
- B . If the link between switch SWB and switch SWC is down, switch SWE will release the secondary port
- C . If the link between switch SWA and switch SWB is down, and the link between switch SWB and switch SWC is down, switch SWE will release the secondary port.
- D . If the link between switch SWA and switch SWB is down, and the link between switch SWA and switch SWD is down, switch SWE will release the secondary port.
The customer’s two switches SWA and SWB are connected together through seven Ethernet cables and configured with dynamic link aggregation. The corresponding ports on switch SWA are Ethernet 1/0/1, Ethernet 1/0/2, Ethernet 1/0/3, Ethernet 1/0/4, Ethernet 1/0/5, Ethernet 1/0/6, and Ethernet 1/0/7.
If switches SWA and SWB support only 6 ports per aggregation group, and the SWA switch has the following configuration:
[SWA] interface Ethernet 1/0/7
[SWA-Ethernet1/0/7] lacp port-priority 4096
Check the LACP status on the device: Output information: as follows:
[SWA] display lacp system-id
Actor System ID: 0x8000,00e1-fc00-5000
[SWB] display lacp system-id
Actor System ID: 0x8000,00e0-fc43-7384
If you change the LACP system priority of SWA to 4096, which of the following you can know from the above information?
- A . When the configuration of each port is consistent, Ethernet1/0/1 port is the aggregation group Unselected
- B . If the configuration of each port is consistent, SWA randomly selects one port from Ethernet 1/0/1 to Ethernet 1/0/6 as the aggregation group UnselectM.
- C . When the configuration of each port is consistent, Ethernet1/0/6 port is the Unselected port of the aggregation group.
- D . When the configuration of each port is consistent, Ethernet1/0/7 port is the Unselected port of the aggregation group.
In the switching network shown in the figure, set VLAN10 as Isolate-user-vlan on switch SWA, and VLAN2 and VLAN3 as Secondary VLAN of VLAN 10; create VLAN4 and VLAN20 on switch SWB, and set VLAN20 as Isolate-user-vlan, and VLAN4 as Secondary VLAN of VLAN20. After setting the IP addresses of each device as shown in the figure, check the MAC address table on SWA, and you can determine that PCC belongs to which of the following?
- A . VLAN 1
- B . VLAN 2
- C . VLAN 3
- D . VLAN 4
- E . VLAN 10
- F . VLAN 20
In the switching network shown in the figure , VLAN 10 is set as Isolate-user-vlan on switch SWA , and VLAN 2 and VLAN 3 are Secondary VLANs of VLAN 10 ; VLAN 4 and VLAN 20 are created on switch SWB , and VLAN 20 is set as Isolate-user-vlan, and VLAN 4 is Secondary VLAN of VLAN 20. After setting the IP addresses of each device as shown in the figure , check the MAC address table on SWB , and you can determine that SWA belongs to which of the following? 
- A . VLAN 1
- B . VLAN 2
- C . VLAN 3
- D . VLAN 4
- E . VLAN 10
- F . VLAN 20
A customer purchased a router . If the performance indicators of this router are MTBF>Y14 8 years and MTTR<U1, then which of the following is the reliability of this router?
- A . 99.9%
- B . 99.99%
- C . 99.999%
- D . 99.9999%
The customer’s two switches SWA and SWB are connected together through seven Ethernet cables and configured with dynamic link aggregation . The corresponding ports on switch SWA are Ethernet 1/0 Ethernet 1/0/2 , Ethernet 1/0/3 , Ethernet 1/0/4 , Ethernet 1/0/5 , Ethernet 1/0/6 , Ethernet1/0/7
If switches SWA and SWB support only 6 ports per aggregation group, and the SWA switch has the following configuration:
[SWA] interface Ethernet 1/0/7
[SWA-Ethernet1/0/7] lacp port-priority 4096 i
Check the LACP status on the device and the output is as follows:
[SWA] display lacp system-id
Actor System ID: 0x8000,00e1-fc00-5000
[SWB] display lacp system-id
Actor System ID: 0x8000,00e0-fc43-7384
What can we learn from the above information?
- A . When the configuration of each port is consistent, Ethernet1/0/1 port is the Unselected port of the aggregation group.
- B . When all ports are configured the same, Ethernet 1/0/2 is the Unselected port in the aggregation group.
- C . When all ports are configured the same, Ethernet 1/0/6 is the Unselected port in the aggregation group.
- D . When all ports are configured the same, Ethernet 1/0/7 is the Unselected port in the aggregation group.
In the switching network shown in the figure, VLAN10 is set as isolate-user-vlan on switch SWA, VLAN2 and VLAN3 are secondary VLANs of VLAN 10; VLAN2-VLAN20 is created on switch SWB, and VLAN20 is set as isolate-user-vlan, and VLAN4 is the secondary VLA of VLAN20. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?
- A . The PCA message enters from the GigabitEthem1/0/1 port of SWA and comes out from the GigabitEthem1/0/3 port with the VLAN Tag VLAN 1
- B . PCA’s message comes out of SWA’s GigabitEthem1/0/3 port and enters SWB’s GigabitEthem1/0/4 port. The VLAN tag it carries is VLAN 10.
- C . When SWB accesses PCA, the message from SWB’s GigabitEth1/0/4 does not carry a VLAN Tag
- D . SWB’s message enters from SWA’s GigabitEthem1/0/3 port and leaves from GigabitEthem1/0/1 port with the VLAN tag VLAN10.
The IP address of host PCA is 40.1.1.1, and the MAC address is 0011.1111.11. It is connected to the GigabitEthernet1/0/1 port of the switch. The following commands are configured on the switch:
[H3C] vlan 10 [H3C-vlan10] quit
[H3C] vlan 20
[H3C-vlan20] protocol-vlan ipv4
[H3C-vlan20] quit
[H3C] vlan 30 [H3C-vlan30] quit
[H3C] mac-vlan mac-address 0022-2222-2222 vlan 30
[H3C] vlan 40
[H3C-vlan40] ip-subnet-vlan ip 40.1.1.0 255.255.255.0
[H3C-vlan40] quit
[H3C] interface GigabitEthernet 1/0/1
[H3C-GigabitEthernet1/0/1] port link-type hybrid
[H3C-GigabitEthernet1/0/1] port hybrid pvid vlan 10
[H3C-GigabitEthernet1/0/1] port hybrid vlan 10 20 30 40 untagged
[H3C-GigabitEthernet1/0/1] port hybrid protocol-vlan vlan 20 0
[H3C-GigabitEthernet1/0/1] port hybrid ip-subnet-vlan vlan 40
[H3C-GigabitEthernet1/0/1] mac-vlan enable
After the configuration is complete, which of the following can be determined that PCA will join?
- A . VLAN 10
- B . VLAN 20
- C . VLAN 30
- D . VLAN 40
In the network connection shown in the figure, SWA and SWB both have STP and Loopback-detection enabled. Please confirm that which of the following status description of each port of SWA and SWB is correct?
- A . SWA’s G1/0/1 may be blocked because STP detects a loop.
- B . STP detects a loop between G1/0/2 or G1/0/3 of SWB and blocks one of them.
- C . Loopback-detection detects a loop between G1/0/2 and G1/0/3 of SWB and blocks one of them.
As shown in the figure, SWA and SWB enable STP, and SWC does not enable STP. Initially, link 2 is not connected, and PCB can send data to PCA. If link 1 fails at this time, the maintenance personnel connect link 2. Which of the following statement about the recovery process of data transmission from PCB to PCA is (assuming that PCA will not actively send data) is correct?
- A . Since the SWA link interruption will trigger the topology change process, the MAC address aging time of SWA and SWB will be shortened, so the service recovery takes 15 seconds by default.
- B . Since SWB port EO/1 takes 30 seconds to enter the forwarding state by default, the service takes 30 seconds to recover by default.
- C . When SWB port EO/1 enters the Forwarding state, it triggers the topology change process, so the service will eventually recover in the default time of 30+15=45 seconds.
- D . Service recovery requires waiting for the MAC address of the SWC to age, so the default time is 300 seconds.
In the switching network shown in the figure, VLAN10 is set as Isolate-user-vlan on switch SWA, VLAN2 and VLAN3 are set as Secondary VLAN of VLAN 10; VLAN2 and VLAN20 are created on switch SWB, and VLAN20 is set as Isolate-user-vlan, and VLAN4 is set as Secondary VLAN of VLAN20. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?
- A . PCA’s message enters from SWA’s GigabitEthe1/0/1 port and comes out from GigabitEthem1/0/3 port with the VLAN tag VLAN10.
- B . PCA’s message comes out of SWA’s GigabitEthem1/0/3 port and enters SWB’s GigabitEthem1/0/4 port without a VLAN Tag.
- C . When SWB accesses PCA, the VLAN tag of the message coming out of SWB’s GigabitEthem1/0/4 port is VLAN20.
- D . SWB’s message does not carry VLAN after it comes out of SWA’s GigabitEthernet1/0/3 from GigabitEthem1/0/1 port
Which of the following statements about ring network technology is correct?
- A . Ethernet ring technology is becoming more mature and low-cost. Technologies to solve the Layer 2 network loop problem include RPR and RRPP.
- B . RRPP (Rapid Ring Protection Protocol) is a network layer protocol specifically used for Ethernet rings.
- C . RRPR requires dedicated hardware, so the cost is higher
- D . The convergence time of RRPP is independent of the number of nodes on the ring network and can be applied to networks with larger network diameters.
In PIM-DM networking, which of the following is correct about the router sending the Prune message?
- A . When the router has no local directly connected multicast receiver, it sends a Prune message to all PIM neighbors.
- B . When the outbound interface list in the router (S, G) table is empty, a Prune message is sent to all PIM neighbors.
- C . The party that fails the Assert will send a
- D . After the router interface receives the Prune message, it will no longer send messages of the corresponding multicast group on this interface.
In the network shown in the figure, after completing the corresponding configuration on the switch SWA, when the switch SWA receives the data frame accessing the PCB from the PCA, it determines whether to check the MAC address table or the routing table?
- A . VLAN attributes of data frames
- B . Destination MAC address of the data frame
- C . Source MAC address of the data frame
- D . Source MAC address of the data frame
- E . Source IP address of the data frame
Which of the following descriptions about H3C switch static routing is correct?
- A . Layer 2 switches do not support routing forwarding, so static routing cannot be configured on Layer 2 switches.
- B . Layer 2 switches can be configured with static routing
- C . Only Layer 3 switches can be configured with static routing
- D . When configuring static routing, the switch can directly specify the outbound interface without specifying the next hop.
Two routers are connected together through a LAN to form a VRRP backup group. The VRRP timer is configured on each interface as follows:
[RTA-GigabitEthernet1 /0] vrrp vrid 1 timer advertise 5
[RTB-GigabitEthernet1/O] vrrp vrid 1 timer advertise 5
VRRP backup group 1 runs normally, RTA is the Master, and RTB is the Backup. If the device runs for a period of time and router RTA fails, the time for router RTB to change from Backup to Master may be?
- A . 3 seconds
- B . 5 seconds
- C . 12 seconds
- D . 20 seconds
SNMP protocol uses C/S structure and uses UDP to realize message transmission. In order to ensure the normal interaction of protocol messages between network management workstation and SNMP, they both need to listen to specific UDP port numbers. Which of the following statements about them is correct?
- A . Both the network management workstation and the SNMP agent listen to UDP port 161
- B . Both the gateway workstation and the SNMP agent listen on UDP port 162
- C . The gateway workstation listens to UDP port 161, and the SNMP agent listens to UDP port 162
- D . The gateway workstation listens to UDP port 162, and the SNMP agent listens to UDP port 161
In the switching network shown in the figure, VLAN 10 is set as the Super VLAN on the switch SWA, and VLAN 2 and VLAN 3 are sub VLANs of VLAN 10. VLAN, port Ethernet1/0/3 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass; VLAN2 and VLAN20 are created on switch SWB, port Ethernet1/0/4 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass. After setting the IP addresses of each device as shown in the figure, it can be determined that which of the following statement is correct?
- A . PCA’s message enters from SWA’s Ethernet1/0/1 port and exits from Ethernet1/0/3 port without a tag
- B . PCA’s message enters from SWA’s Ethernet1/0/1 port and exits from Ethernet1/0/3 port with VLAN Tag VLAN 1
- C . The PCA message enters from the Ethernet1/0/1 port of SWA and comes out from the Ethernet1/0/3 port with the VLAN Tag of VLAN2
- D . The PCA message enters from the Ethernet 1/0/1 port of SWA and comes out from the Ethernet 1/0/3 port with the VLAN Tag of VLAN 10.
As shown in the title figure, SWA, SWB, SWC and SWD have STP enabled. SWA, SWB and SWC form a loop. After the topology is stable, SWD and SWB are connected. Assuming that the cost of each link is the same, which of the following statements about the topology change process of STP are correct?
- A . SWD will send TCN BPDU from port E0/1
- B . SWB will send TCN BPDU from port E0/2
- C . If the link between SWC and SWA is disconnected, SWC will send a TCN BPDU from port E0/3
- D . If the link between SWB and SWC is disconnected, both SWB and SWC will send TCN BPDUs from port EO/2.
Which of the following statements about the generation of TCNBPDU is correct?
- A . If a port of a non-root bridge switch with STP enabled is connected to a PC, the switch will not generate TCN BPDU when the port enters the forwarding state.
- B . If the link of a designated port of a switch in the network is broken, the switch will definitely generate a TCNBPDU
- C . If the alternate port of a switch in the network is down, the switch will not generate TCN BPDU
- D . When a switch port is selected as a designated port or root port, the switch will immediately send TCNBPDU
Switches SWA and SWB are connected together through two optical fiber Gigabit Ethernet links, and the following interface configuration is available on switch SWA:
[SWA] interface GigabitEthernet 1/0/1
[SWA-GigabitEthernet1/0/1] gvrp
[SWA-GigabitEthernet1/0/1] port link-type trunk
[SWA-GigabitEthernet1/0/1] port trunk permit vlan 1 10
[SWA] interface GigabitEthernet 1/0/2
[SWA-GigabitEthernet1/0/2] port link-type trunk
[SWA-GigabitEthernet1/0/2] port trunk permit vlan 1 10
If you want to configure link aggregation to aggregate these two links, if the configuration on SWB is correct, which of the following you can know from the above information?
- A . Only when all VLANs are allowed to pass through GigabitEthernet1/0/2 and Gigabit1/0/1, can the two be added to the same aggregation group.
- B . Only when the configuration of GigabitEthe1/0/2 is changed to be consistent with that of GigabitEthe1/0/1, can the two be added to the same aggregation group.
- C . After link aggregation is configured on SWA and SWB, if both SWA and SWB enable MSTP on the aggregation port, one of GigabitEthe1/0/1 and GigabitEthe1/0/2 will be blocked.
- D . After link aggregation is configured on SWA and SWB, if both SWA and SWB enable MSTP on the aggregation ports, GigabitEthernet1/0/1 and GigabitEthe1/0/2 can participate in forwarding.
In the switching network shown in the figure, VLAN 10 is set as lsolate-user-vlan on switch SWA, and VLAN 2 and VLAN 3 are set as Secondary VLAN of VLAN 10; VLAN 20 is created on switch SWB, and VLAN 20 is set as lsolate-user-vlan, and VLAN 4 is set as Secondary VLA of VLAN 20. After setting the IP addresses of each device as shown in the figure, the local proxy ARP function is enabled on SWA and SWB. Initially, the switch and PC did not learn their corresponding ARP entries. When PCA pings PCB, PCA will send an ARP request. What is the source MAC address of the ARP request message forwarded by the switch to PCB?
- A . 0000.0000.0000
- B . 0011.1111.1111
- C . 00E0.FC00.0010
- D . 00E0.FC00.0020
In the network shown in the figure, switch SWA is a layer 2 switch, and router RTA is the gateway of each PC. The following configuration is made on router RTA:
[RTA] interface Ethernet 0/0.1
[RTA-Ethernet0/0.1] ip address 10.10.10.1 255.255.255.0
[RTA-Ethernet0/0.1] vlan-type dotlq vid 1
[RTA-Ethernet0/0.1] interface ethernet 0/0.2
[RTA-Ethernet0/0.2] ip address 20.20.20.1 255.255.255.0
[RTA-Ethernet0/0.2] vlan-type dotlq vid 2
[RTA-Ethernet0/0.2] interface ethernet 0/0.3
[RTA-Ethernet0/0.3] ip address 30.30.30.1 255.255.255.0
[RTA-Ethernet0/0.3] vlan-type dotlq vid 3
After completing the configuration on switch SWA, PCA, PCB, and PCC can all ping their own gateways. Which of the following is correct about switch SWA port Ethernet1/0/4?
- A . interfaceEthernet1/0/4 port link-mode bridge port link-type trunk
Port trunk permit vlan all - B . interfaceEthernet1/0/4 port link-mode bridge port link-type trunk
Port trunk permit vlan all port trunk pvid vlan 2 - C . interface Ethernet1/0/4 port link-mode bridge port link-type trunk
Port trunk permit vlan all port trunk pvid vlan 3 - D . interface Ethernet 1/0/4 port link-mode bridge port link-type trunk
Port trunk permit vlan all port trunk pvid vlan 10
Switches SWA and SWB are connected together through two optical fiber Gigabit Ethernet links, and the following interface configuration is available on switch SWA:
[SWA] interface GigabitEthernet 1/0/1
[SWA-GigabitEthernet 1/0/1] gvrp
[SWA-GigabitEthernet 1/0/1] port link-type trunk
[SWA-GigabitEthernet 1/0/1] port trunk permit vlan 1 10
[SWA] interface GigabitEthernet 1/0/2
[SWA-GigabitEthernet 1/0/2] port link-type trunk
[SWA-GigabitEthernet 1/0/2] port trunk permit vlan 1 10
From the above, we can know which of the following?
- A . GigabitEthernet1/0/1 and GigabitEthe1/0/2 cannot be added to the same aggregation group
- B . Only when the configuration of GigabitEthe1/0/2 is changed to be consistent with that of GigabitEthe1/0/1, can the two be added to the same aggregation group.
- C . If MSTP is enabled on the SWA4 switch, one of GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 will be blocked.
- D . If the SWA switch has MSTP enabled, GigabitEthe1/0/1 and GigabitEthe1/0/2 can participate in forwarding
The IP address of host PCA is 40.1.1.1, and the MAC address is 0011.1111.1111. PCA is connected to the GigabitEthernet1/0/1 port of switch SWA. The following commands are configured on switch SWA:
[SWA] vlan 10
[SWA-vlan10] quit
[SWA] vlan 20
[SWA-vlan20] protocol-vlan ipv4
[SWA-vlan20] quit
[SWA] vlan 30
[SWA-vlan30] quit
[SWA] mac-vlan mac-address 0011 1111-1111 vlan 30
[SWA] vlan 40
[SWA-vlan40] ip-subnet-vlan ip 40.1.1.0 255.255.255.0
[SWA-vlan40] quit
[SWA] interface GigabitEthernet 1/0/1
[SWA-GigabitEthernet1/0/1] port link-type hybrid
[SWA-GigabitEthernet1/0/1] port hybrid pvid vlan 10
[SWA-GigabitEthernet1/0/1] port hybrid vlan 10 20 30 40 untagged
[SWA-GigabitEthernet1/0/1] port hybrid protocol-vlan vlan 20 0
[SWA-GigabitEthernet1/0/1] port hybrid ip-subnet-vlan vlan 40
[SWA-GigabitEthernet1/0/1] mac-vlan enable
After the configuration is complete, which of the following can be determined that PCA will join?
- A . VLAN 10
- B . VLAN 20
- C . VLAN 30
- D . VLAN 40
- E . The configuration command is incorrect
The customer’s six switches SWA, SWB, SWC, SWD, SWE, and SWF are connected together through a LAN to form an RRPP ring. The RRPP status is checked on SWB as follows:
<SWB>dis rrpp verbose domain 1 Domain ID: 1
Ring ID: 1 Ring Level: 0
Node Mode: Transit Ring state: –
Enable Status: YesActive Status: Yes
Primary port: GigabitEthernet2/0/1 Port status: UP Secondary port: GigabitEthernet2/0/2 Port status: UP Ring ID :2
Ring Level: 1 Node Mode: Edge Ring state: –
Enable Status: YesActive Status: Yes
Common port: GigabitEthernet2/0/1 Port status: UP GigabitEthernet2/0/2 Port status: UP
Edge port: GigabitEthernet2/0/3 Port status: UP Ring ID: 3
Ring Level: 1
Node Mode: Edge Ring state: –
Enable Status: YesActive Status: Yes
Common port: GigabitEthernet2/0/1 Port status: UP GigabitEthernet2/0/2 Port status: UP
Edge port: GigabitEthernet2/0/4 Port status: UP
What can we learn from the above information?
- A . SWB is the transit node of RRPP sub-ring 2
- B . SWB is connected to 3 sub-rings
- C . GigabitEthernet2/0/1 is the edge port of RRPP sub-ring 2
- D . GigabitEthernet2/0/4 is the edge port of RRPP sub-ring 3
In the network shown in the figure, the corresponding configuration is completed on the switch SWA, and the switch SWA and each PC have learned the corresponding ARP.
PCA accesses PCB and sends an ICMP request message. Switch SWA forwards which of the following MAC address to PCB?
- A . MAC_A
- B . MAC10
- C . MAC20
- D . 0000.0000.0000
The figure shows the networking application of RRPP. The customer LAN switches SWA, SWB, SWC, and SWD form the RRPP ring main ring 1, switches SWB, SWC, and SWE form sub-ring 2, and switches SWB, SWC, and SWF form sub-ring 3. If switch SWE is the master node of sub-ring 2, SWF is the master node of sub-ring 3, and switch SWB is the edge node of sub-ring 2 and sub-ring 3, in order to eliminate the defect of broadcast storm under specific conditions of RRPP dual-homing networking, which of the following can be known from the above information?
- A . If the link between switch SWA and switch SWD is down, the edge port on switch SWB will be blocked.
- B . If the link between switch SWB and switch SWC is in Down state, the edge port on switch SWB will be blocked.
- C . If the link between switch SWA and switch SWB is down, and the link between switch SWB and switch SWC is down, the edge port on switch SWB will be blocked.
- D . If the link between switch SWA and switch SWB is down, and the link between switch SWA and switch SWD is down, the edge port on switch SWB will be blocked.
In the switching network shown in the figure, VLAN10 is set as lsolate-user-vlan VLAN2 and VLAN3 as the Secondary VLAN of VLAN 10 on switch SWA; VLAN2-VLAN20 is created on switch SWB, and VLAN20 is set as lsolate-user-vlan, and VLAN4 is the Secondary VLAN of VLAN20. After setting the IP addresses of each device as shown in the figure, which of the following statements are correct?
- A . PCA’s message enters from SWA’s GigabitEther1/0/1 port and exits from GigabitEther1/0/3 port without VLAN Tag.
- B . PCA’s message comes out from SWA’s GigabitEthem1/0/3 port and enters SWB’s GigabitEthe1/0/3 port. The VLAN tag it carries is VLAN2.
- C . When SWB accesses PCA, the VLAN tag of the message from SWB’s GigabitEthem1/0/4 is VLAN 1.
- D . SWB’s message enters from SWA’s GigabitEthem1/0/3 port, and the VLAN tag it carries after exiting from GigabitEthem1/0/1 port is VLAN2
As shown in the figure, the switches all run RSTP. Initially, SWA, SWB and SWC are interconnected through links 1, 2 and 3. When the network connection undergoes the following changes, which of the following is the correct statement?
- A . When the link between SWB and SWC is DOWN, both SWB and SWC will send RST BPDU with TC set.
- B . As shown in the figure, when SWB is connected to another switch SWD running RSTP, SWB will send RSTBPDU with TC set.
- C . As shown in the figure, when SWB is connected to another switch SWD running RSTP, SWD will send RSTBPDU with TC set.
- D . When the edge port EO/1 of SWC is connected to a PC, SWC will send a RST BPDU with TC set.
SWA/SWB/SWC are in the same MSTP region and configured with the same region configuration
Stp region-configuration region-name h3c
Instance 1 vlan 10
Instance 2 vlan 20
Instance 2 vlan 30
Active region-configuration
The ports of the three interconnected links are all Access and belong to the VLANs identified in the figure. The three switches create VLAN virtual interfaces corresponding to the Access links and run OSPF on the virtual interfaces. The IP addresses of the VLAN virtual interfaces are assigned as follows:
SWA: vlan-interface 10 (192.168.10.1); vlan-interface 30 (192.168.30.1)
SWB: vlan-interface 10 (192.168.10.2); vlan-interface 20 (192.168.20.1)
SWC: vlan-interface 20 (192.168.20.2); vlan-interface 30 (192.168.30.2)
When all interconnected ports are UP and STP and OSPF calculations are complete, which of the following descriptions of network connectivity are correct?
- A . The three switches can establish OSPF neighbor relationships between each other
- B . Two of the three switches cannot establish an OSPF neighbor relationship
- C . All interconnected addresses of the three switches are reachable to each other
- D . Among the 6 interconnected addresses, at least two interconnected addresses are unreachable to each other
When the host receives the GeneralQuery message from the IGMPV2 querier?
- A . The host immediately sends a MembershipReport message
- B . The destination address of the Report message is the same as the GroupAddress in the message
- C . The destination address of the Report message is 224.0.0.1
- D . The host will send a Membership Report message only after receiving a General Query.
Two routers are connected together through a LAN to form a VRRP backup group. The configuration on each interface is as follows:
[RTA-GigabitEthernet1/0] display this
IP address 192.168.0.252 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.1.254
Vrrp vrid 1 priority 120
[RTB-GigabitEthernet1/0] display this
IP address 192.168.0.253 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.1.254
What can we learn from the above information?
- A . RTA is the Master router of the backup group
- B . RTB is the Master router of the backup group
- C . RTA and RTB are both in VRRP Initialize state
- D . RTA and RTB are both in VRRP Master state
Which of the following is the core goal of high-reliability redundant network design?
- A . Maximize network bandwidth
- B . Maximize network access security
- C . Minimize the existence of single point failures in the network
- D . Minimize network management complexity
The customer LAN switches SWA, SWB, and SWC form the RRPP ring main ring 1. The switch SWA has the following configuration information:
[SWA] rrpp domain 1
[SWA-rrpp-domain1] control-vlan 4092
Which of the following information can be obtained?
- A . The primary ring control VLAN on switches SWB and SWC can be different from that on SWA.
- B . All ports on switches SWA, SWB, and SWC need to be added to VLAN 4092
- C . The ports on switches SWA, SWB, and SWCRRPP rings that access the RRPP ring need to be added to VLAN 4092
- D . To facilitate network management, you can configure an IP management address on VLAN 4092.
Which of the following statements about the principle of SmartLink & Monitor Link is correct?
- A . SmartLink is a port linkage solution that monitors the device uplink. The Up/Down status change of the uplink triggers the Up/Down change of the downlink.
- B . MonitorLink implements redundant backup of the primary and backup links, and enables traffic to be quickly switched to the backup link when the primary link fails.
- C . MonitorLink sends Flush messages to notify other devices to refresh the MAC address forwarding table and ARP table entries.
- D . SmartLink sends Flush messages to notify other devices to refresh MAC address forwarding entries and ARP entries.
Which of the following statements about the PIM SM registration process are correct?
- A . Unlike the PUSH method of PIM DM, in PIM SM, the multicast source starts sending multicast traffic only when there are downstream receivers.
- B . When the multicast source initially sends traffic, the DR connected to it will encapsulate several empty Register messages to register with the RP
- C . After receiving the source registration message for the first time, RP will send a (*, G) join message to the multicast source and establish a (*, G) table entry along the way.
- D . After the RP receives the multicast forwarding traffic from the multicast source, it forwards the traffic to its downstream interface until it reaches the multicast receiver, forming an RPT from the RP to the multicast receiver along the way.
The network topology is shown in the figure. STP is enabled on SWA and SWD. Which of the following statements about the changes in the status of SWA and SWD ports are correct?
- A . SWD port E0/1 will change from a designated port to a root port in the Listening state.
- B . If the cost value of the SWD port E0/2 link is changed to 100, port E0/2 will immediately become the new root port and enter the Forwarding state.
- C . If the bridge priority of SWD is set to 0, the ports E0/1 and E0/2 of SWD will enter the Forwarding state after the Listening state and the Learning state.
- D . If the bridge priority of SWD is set to 0, the role of port E0/1 of SWA will change from designated port to root port, and the port will maintain the Forwarding state during the change.
Which of the following statements about BSR and RP in PIMSM are correct?
- A . There can only be one BSR in a PIMSM domain.
- B . There can be only one C-BSR in a PIMSM domain
- C . There can only be one RP in a PIMSM domain.
- D . There can be only one C-RP in a PIMSM domain.
Which of the following belongs to the function of the convergence layer?
- A . Has a large number of interfaces for connecting to end-user computers
- B . Access security control
- C . High-speed packet switching
- D . Complex routing strategies
The customer has two switches SWA and SWB connected together through a LAN. The two switches SWA and SWB form a link aggregation group. Check the aggregation group status on SWA as follows:
[SWA] display link-aggregation verbose
Loadsharing Type: Shar — Loadsharing ， NonS — Non-Loadsharing Port Status: S — Selected ， U — Unselected
Flags: A — LACP_Activity ， B — LACP_Timeout ， C — Aggregation ， D — Synchronization ， E — Collecting ， F — Distributing ， G — Defaulted ， H — Expired
System ID: 0x8000 ， 000f-e245-6bc0 Local ：
Port StatusPriority Oper-KeyFlag GE1/0/1S 327682 {ACDEF}KOKOMADE
GE1/0/2S 327682 {ACDEF}KOKOMADE
GE1/0/3S 327682 {ACDEF}KOKOMADE
Remote ：
ActorPartner Priority Oper-KeySystemID Flag
GE1/0/125327682 0x8000 ， 000f-e23d-59f0 {ACDEF}KOKOMADE GE1/0/226327682 0x8000 000f-e23d-59f0 {ACDEF}KOKOMADE GE1/0/327327682 0x8000 000f-e23d-59f0 {ACDEF}KOKOMADE
What can we learn from the above information?
- A . A static aggregation group is established between switches SWA and SWB.
- B . A dynamic aggregation group is established between switches SWA and SWB.
- C . LACP priority is 0x8001
- D . Link aggregation port bandwidth size 2G
Before configuring Layer 3 multicast, which of the following is the first thing you need to do?
- A . Enter IGMP view
- B . SB sets the IGMP protocol version
- C . Configure the PIM protocol
- D . Enable multicast globally using the multicast routing-enable command
Which of the following addresses is not an IPv4 multicast address?
- A . 232.255.255.255
- B . 242.255.255.250
- C . 239.255.255.255
- D . 224.0.0.13
The figure shows the networking of Smart Link and Monitor Link cascade. The Smart Link group on switch SWH is used as the uplink port of the Monitor Link group on switch SWH, and the peer port of the downlink port of the Monitor Link group is the master port of the Smart Link group on switch SWJ. The uplink SWD and SWE ports of switch SWH are the ports of the Smart Link group. What can we learn from the above information?
- A . If the link of switch SWH to switch SWD is down, the master port of switch SWJ Smart Link group will switch to the slave port.
- B . If the link of switch SWH to switch SWE is down, the primary port of the Smart Link group of switch SWJ will switch to the secondary port.
- C . If the links of the upstream switches SWD and SWE of switch SWH are both in Down state, the primary port of the Smart Link group of switch SWJ will be switched to the secondary port.
- D . The Smart Link group status of switch SWJ has nothing to do with switch SWH
A customer purchased a router. If the performance indicators of this router are MTBFW5000 and MTTRSOQ 5, then which of the following is the reliability of this router?
- A . 99.9%
- B . 99.99%
- C . 99.999%
- D . 99.9999%
In the switching network shown in the figure, VLAN10 is set as Super VLAN on switch SWA, VLAN2 and VLAN3 are Sub VLANs of VLAN10. Port Ethernet1/0/3 is a Trunk port with PVID of VLAN1, allowing all VLANs to pass through. VLAN2~VLAN20 are created on switch SWB, port Ethernet1/0/4 is a Trunk port with PVID of VLAN1, allowing all VLANs to pass through. After setting the IP addresses of each device as shown in the figure, check the MAC address table on SWA, and you can determine that PCC belongs to?
- A . VLAN 1
- B . VLAN 2
- C . VLAN 3
- D . VLAN 10
After executing the display interface Ethernet 1/0/1 command on the switch SWA, the output information is as follows: From the above output, what can be inferred from the above output?
[SWA] display interface Ethernet 1/0/2
Ethernet1/0/2 current state: UP
………….
PVID: 10
Mdi type: auto
Link delay is 0 (sec)
Port link-type: trunk
VLAN passing: 1 (default vlan), 10
VLAN permitted: 1 (default vlan), 2-4094
Trunk port encapsulation: IEEE 802.1q
Port priority: 0
- A . The data frame with VLAN10 tag will not be stripped when it leaves port Ethernet 1/0/1.
- B . The data frame with VLAN10 tag will be stripped of the tag when it leaves port Ethernet 1/0/1
- C . Data frames with VLAN1 tags will be discarded when they enter port Ethernet 1/0/1
- D . The data frame with VLAN10 tag is discarded when it enters port Ethernet 1/0/1
A customer wants to deploy 802.1X in the LAN to improve access security. At the same time, the customer wants to use the port security feature to temporarily close the port for 5 minutes to prevent illegal users from accessing the network. Which of the following features can be used to achieve this?
- A . NeedToKnow feature
- B . InstrusionProtection Features
- C . Trap Features
- D . ntk temporary characteristics
Which of the following statements is correct regarding the configuration of the spanning tree protection mechanism?
- A . BPDU protection needs to be configured in the port view designated as the edge port.
- B . The root bridge protection command will only play a protective role when it is configured on the root bridge in the network.
- C . The loop protection command needs to be configured on each port on the physical loop.
- D . After configuring the TC protection threshold, if the number of TC messages received by the device within the default 10 seconds exceeds the threshold, the device will no longer delete the address table entry within these 10 seconds.
The figure shows the networking application of RRPP. The switches SWA, SWB, SWC, and SWD in the customer LAN form the main ring 1 of the RRPP ring. The switches SWB, SWC, and SWE form the sub-ring 2. The switches SWB, SWC, and sWF form the sub-ring 3. If the switch SWE is the master node of the sub-ring 2 and SWF is the master node of the sub-ring 3, What can we learn from the above information?
- A . It is not possible to add sub-ring 2 and sub-ring 3 to the same ring group.
- B . If sub-ring 2 and sub-ring 3 are added to the same ring group, the edge nodes and auxiliary edge nodes of sub-ring 2 and sub-ring 3 in the ring group can be different
- C . If sub-ring 2 and sub-ring 3 are added to the same ring group, the ring groups should be configured on the switches SWB, SWC, SWE, and SWF respectively and the configurations should be consistent.
- D . If sub-ring 2 and sub-ring 3 are added to the same ring group, the primary ring links corresponding to the edge nodes and auxiliary edge nodes of sub-ring 2 and sub-ring 3 in the ring group should be consistent.
If port-based VLAN, MAC address-based VLAN, protocol-based VLAN and IP subnet-based VLAN are enabled on a port of the switch, by default, the VLANs will be matched in order?
- A . Port VLAN MACVLAN Protocol VLAN IP Subnet VLAN
- B . Port VLAN IP Subnet VLAN Port VLAN MAC VLAN
- C . MACVLAN Port VLAN Protocol VLAN Subnet VLAN
- D . MACVLAN Subnet VLAN Protocol VLAN Port VLAN
Two routers are connected together through a LAN to form a VRRP backup group. The configuration on each interface is as follows:
[RTA-GigabitEthernet1/0] display this
IP address 192.168.0.252 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
Vrrp vrid 1 priority 120 vrrp vrid 1 preempt-mode
Vrrp vrid 1 track interface serial0/1 reduced 30
[RTB-GigabitEthernet1/0] display this
IP address 192.168.0.253 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254 vrrp vrid 1 preempt-mode
If a DOWN/UP event occurs on the RTA serial port Serial0/1 during network operation, what can we learn from the above information?
- A . During the DOWN/UP period of the RTA serial port Serial0/1, the router that responds to the ARP request of the LAN PC will not change.
- B . During the RTA serial port Serial0/1 DOWN/UP period, the router that responds to the LAN PC ARP request changes once
- C . During the DOWN/UP period of RTA serial port Serial0/1, the router that responds to the ARP request of the LAN PC changes twice
- D . During the DOWN/UP period of RTA serial port Serial0/1, the router that responds to the ARP request of the LAN PC changes 3 times
Three routers RTA, RTB, and RTC are connected together through a LAN to form a VRRP backup group. The interface configuration of each router is as follows:
RTA’s GigabitEthernet
IP address 192.168.0.252 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
Vrrp vrid 1 priority 120 RTB GigabitEthernet
IP address 192.168.0.253 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
Vrrp vrid 1 priority 90 RTC GigabitEthernet
IP address 192.168.0.254 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
what can we learn from the above information?
- A . RTA is the Master router of the backup group
- B . RTB is the Master router of the backup group
- C . RTC is the Master router of the backup group
- D . After RTA is sent, RTB is the Master router of the backup group
Two routers are connected through a LAN to form a VRRP backup group. The configuration on each interface is as follows:
[RTA-GigabitEthernet1 /0] display this
IP address 192.168.0.252 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
[RTB-GigabitEthernet1/0] display this
IP address 192.168.0.253 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
what can we learn from the above information?
- A . RTA is the Master router of the backup group
- B . RTB is the Master router of the backup group
- C . RTA and RTB cannot elect a master router for the backup group
- D . RTA and RTB are both in VRRP Master state
The IP address of host PCA is 40.1.1.1, and the MAC address is 0011.1111.1111. It is connected to the GigabitEthernet1/0/1 port of switch SWA. The following commands are configured on switch SWA:
[SWA] vlan 10
[SWA-vlan10] quit
[SWA] vlan 20
[SWA-vlan20] protocol-vlan ipv4
[SWA-vlan20] quit
[SWA] vlan 30 [SWA-vlan30] quit
[SWA] mac-vlan mac-address 0011-1111-1111 vlan 30
[SWA] vlan 40
[SWA-vlan40] ip-subnet-vlan ip 50.1.1.0 255.255.255.0
[SWA-vlan40] quit
[SWA] interface GigabitEthernet 1/0/1
[SWA-GigabitEthernet1/0/1] port link-type hybrid
[SWA-GigabitEthernet1/0/1] port hybrid pvid vlan 10
[SWA-GigabitEthernet1/0/1] port hybrid vlan 10 20 30 40 untagged
[SWA-GigabitEthernet1/0/1] port hybrid protocol-vlan vlan 20 0
[SWA-GigabitEthernet1/0/1] port hybrid ip-subnet-vlan vlan 40
[SWA-GigabitEthernet1/0/1] mac-vlan enable
[SWA-GigabitEthernet1/0/1] vlan precedence ip-subnet-vlan
After the configuration is complete, can you tell which one the PCA will join?
- A . VLAN 10
- B . VLAN 20
- C . VLAN 30
- D . VLAN 40
In the switching network shown in the figure, VLAN10 is set as Super VLAN on switch SWA, VLAN2 and VLAN3 are Sub VLANs of VLAN10, port Ethernet1/0/3 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass; VLAN2 and VLAN20 are created on switch SWB, port Ethernet1/0/4 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass. After setting the IP addresses of each device as shown in the figure, you can judge which of the following?
- A . SWB can communicate with PCA
- B . SWB can communicate with PCB
- C . SWB can communicate with PCC
- D . SWB can communicate with SWA
- E . None of the above answers are correct
Regarding the relationship between RSTP and STP, which of the following is correct statement?
- A . RSTP is defined in the old EE802.1 D standard. Its protocol concept is the same as STP, but it has improved the convergence time.
- B . Switches running RSTP can work together with switches running STP and improve the convergence time of STP.
- C . RSTP can realize load sharing of data from different VLANs on Trunk links based on STP.
- D . RSTP has all the functions of STP, but it only uses one type of BPDU
Two routers are connected together through a LAN to form a VRRP backup group. The configuration on each interface is as follows:
[RTA-GigabitEthernet1/0] display this
IP address 192.168.0.252 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
[RTB-GigabitEthernet1/0] display this
IP address 192.168.0.253 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.1.254
What can we learn from the above information?
- A . RTA is the Master router of the backup group
- B . RTB is the Master router of the backup group
- C . RTA and RTB cannot elect a backup group master router
- D . RTA and RTB are both in VRRP Master state
In the switching network shown in the figure, VLAN 10 is set as lsolate-user- vlan on switch SWA, and VLAN 2 and VLAN 3 are secondary VLANs of VLAN 10; VLAN 2 and VLAN 20 are created on switch SWB, and VLAN 20 is set as lsolate-user-vlan, and VLAN 4 is secondary VLAN of VLAN 20. After setting the IP addresses of each device as shown in the figure, which of the following statement is correct?
- A . PCA’s message enters from SWA’s GigabitEthem1/0/1 port and comes out from GigabitEthem1/0/3 port with the VLAN tag VLAN2.
- B . PCA’s message comes out of SWA’s GigabitEthem1/0/ port and enters SWB’s GigabitEthem1/0/4 port. The VLAN tag it carries is VLAN20.
- C . When SWB accesses PCA, the VLAN tag of the message from SWB’s GigabitEthem1/0/4 is VLAN10
- D . SWB’s message enters from SWA’s GigabitEthem1/0/3 port, and the VLAN tag it carries after exiting from GigabitEthem1/0/3 port is VLAN20
Which of the following are the advantages of modular network architecture?
- A . It replaces the traditional hierarchical network model, making it easier to plan and deploy the network.
- B . Allow different application functions or application systems to share data, resources and capabilities and participate in business processes
- C . Allows dynamic invocation of IT resources through open interfaces to achieve a standard, compatible, secure, intelligent and manageable IT application environment
- D . Each module can be planned and deployed separately. Network functions can be added or removed by adding or removing modules, which is conducive to building complex networks.
The customer’s LAN switch SWA is connected to SWB via GigabitEthernet 2/0/1 and to SWC via GigabitEthernet 2/0/2 and the SWA switch has the following configuration:
[SWA] smart-link group 1
[SWA-smlk-group1] protected-vlan reference-instance 0 to 32
[SWA-smlk-group1] port gigabitethernet 2/0/1 slave
[SWA-smlk-group1] port gigabitethernet 2/0/2 master
[SWA-smlk-group1] flush enable control-vlan 10
If the interconnection interfaces of switches SWA, SWB, and SWC allow all VLANs to pass, what can we learn from the above information?
- A . Normally, the SWA switch traffic will be upstream through Gigabitethernet 2/0/1
- B . Under normal circumstances, SWA switch traffic will be upstream through Gigabitethernet 2/0/2
- C . If the GigabitEthernet 2/0/1 port fails, the SWA switch will broadcast flush messages in all VLANs.
- D . If the Gigabitethernet 2/0/2 port fails, the SWA switch will broadcast flush messages in all VLANs.
In the switching network shown in the figure, VLAN 10 is set as Super VLAN on switch SWA, VLAN2 and VLAN3 are Sub VLANs of VLAN 10, port Ethernet/0/3 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass; VLAN2~VLAN20 are created on switch SWB, port Ethernet/0/4 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass. After setting the IP addresses of each device as shown in the figure, check the MAC address table on SWB and you can determine that PCA belongs to?
- A . VLAN 1
- B . VLAN2
- C . VLAN3
- D . VLAN 10
The customer’s LAN switch SWA is dual-uplinked to switch SWB and switch SWC, and link reliability is guaranteed by Smart Link. If the MAC address of switch SWA is 000f-e269-42d1, the MAC address of switch SWB is 000f-e269-42d2, and the MAC address of switch SWC is 000f-e269-42d3, what can we learn from the above information?
- A . When the line connecting switch SWA to switch SWB fails, the destination mac of the Flush message sent by switch SWA is 000f-e269-42d1
- B . When the line connecting switch SWA to switch SWB fails, the destination mac of the Flush message sent by switch SWA is 000f-e269-42d2
- C . When the line connecting switch SWA to switch SWB fails, the destination mac of the Flush message sent by switch SWA is 000f-e269-42d3
- D . None of the above answers are correct
The Ethernets port of switch SWA is configured as follows:
Interface Ethernet 1/0/1 port link-type trunk
Port trunk permit vlan 10 port trunk pvid vlan 20
Now we need to change the Ethernet 1/0/1 port of switch SWA to a Hybrid port, with PVID of VLAN 20, and do not tag the data frames of VLAN 20 when sending them, but tag the data frames of VLAN 10 when sending them. Which of the following configuration processes is correct?
- A . [SWA-Ethernet1/0/1] port link-type access
[SWA-Ethernet1/0/1] port access vlan 20
[SWA-Ethernet1/0/1] port link-type hybrid
[SWA-Ethernet1/0/1] port hybrid vlan 10 tagged - B . [SWA-Ethernet1/0/1] portlink-type access
[SWA-Ethernet1/0/1] port link-type hybrid
[SWA-Ethernet1/0/1] port hybrid pvid vlan 20
[SWA-Ethernet1/0/1] port hybrid vlan 10 tagged - C . [SWA-Ethernet1/0/1] undoportlink-type
[SWA-Ethernet1/0/1] portlink-typeHybrid
[SWA-Ethernet1/0/1] port hybrid pvid vlan 20
[SWA-Ethernet1/0/1] port hybrid vlan 10 tagged - D . [SWA-Ethernet1/0/1] port link-type hybrid
- E . None of the above is correct
The IP address of host PCA is 40.1.1.1, and the MAC address is 0011.1111.1111. PCA is connected to [SWA] vlan 10 of switch SWA.
[SWA-vlan10] quit
[SWA] vlan 20
[SWA-vlan20] protocol-vlan ipv4
[SWA-vlan20] quit
[SWA] vlan 30
[SWA-vlan30] quit
[SWA] mac-vlan mac-address 0011-1111-1111 vlan 30
[SWA] vlan 40
[SWA-vlan40] ip-subnet-vlan ip 40.1.1.0 255.255.255.0
[SWA-vlan40] quit
[SWA] interface GigabitEthernet 1/0/1
[SWA-GigabitEthernet1/0/1] port link-type hybrid
[SWA-GigabitEthernet1/0/1] port hybrid pvid vlan 10
[SWA-GigabitEthernet1/0/1] port hybrid vlan 10 20 30 40 untagged
[SWA-GigabitEthernet1/0/1] port hybrid protocol-vlan vlan 20 0
[SWA-GigabitEthernet1/0/1] port hybrid ip-subnet-vlan vlan 40
[SWA-GigabitEthernet1/0/1] mac-vlan enable
[SWA-GigabitEthernet1/0/1] vlan precedence ip-subnet-vlan
After the configuration is completed, which of the following can be determined that PCA will join?
- A . VLAN 10
- B . VLAN20
- C . VLAN30
- D . VLAN40
E The configuration command is incorrect.
In the switching network shown in the figure, VLAN10 is set as Isolate-user-vlan on switch SWA, and VLAN2 and VLAN3 are set as Secondary VLAN of VLAN 10; VLAN4 and VLAN20 are created on switch SWB, and VLAN20 is set as Isolate-user-vlan and VLAN4 is set as Secondary VLAN of VLAN20. After setting the IP addresses of each device as shown in the figure, the local proxy ARP function is enabled on SWA and SWB. Initially, the switch and PC did not learn their corresponding ARP entries. When PCA pings PCB, PCA will send an ARP request. After PCB receives the ARP request message, it sends a destination MAC response with the destination MAC address as?
- A . FFFF.FFFF.FFFF
- B . 0011.1111.1111
- C . 00E0.FC00.0010
- D . 00E0.FC00.0020
Which of the following mirroring technology that can achieve cross-switch?
- A . Port mirroring
- B . Flow mirroring
- C . Remote Mirroring
- D . Local mirror
In the network shown in the figure, the corresponding configuration is completed on the switch SWA, and the switch SWA and each PC have learned the corresponding ARPPCA. When accessing PCB, ICMP request message is sent, and the destination MAC address of the message is?
- A . FFFF.FFFF.FFFF
- B . MAC-10
- C . MAC-20
- D . MAC-B
Two switches SWA and SWB are connected together through four Ethernet cables. The corresponding ports on switch SWA are Ethernet 1/0/1, Ethernet 1/0/2, Ethernet 1/0/3, and Ethernet 1/0/4. Static link aggregation is configured for these four ports on SWA. What can we learn from the above information?
- A . When all ports are configured the same, Ethernet 1/0/1 is the reference port for the aggregation group.
- B . When all ports are configured the same, Ethernet 1/0/2 is the reference port for the aggregation group.
- C . When the configuration of each port is consistent, Ethernet1/0/3 port is the reference port of the aggregation group
- D . If all ports are configured the same, Ethernet 1/0/4 is the reference port for the aggregation group.
The customer LAN switches SWA, SWB, SWC, and SWD form the RRPP ring main ring 1. Switch SWD is connected to switches SWB and SWC, but not to switch SWA.
The switch SWD has the following configuration information:
[SWD] rrpp domain 1
[SWD-rrpp-domain 1] ring 1 node-mode transit primary-port gigabitethernet 2/0/1 secondary-port
Gigabitethernet 2/0/2 level 0
If switch SWA is the master node of primary ring 1, and if switch SWD port GigabitEtherent2/0/1 fails, what can we learn from the above information?
- A . SWA will send a Link-Down message to notify all nodes
- B . The switch SWA immediately switches to the Failed state and releases the secondary port
- C . The switch SWC immediately switches to the Failed state and releases the secondary port.
- D . If the switch SWD finds that the port GigabitEthernet2/0/1 is Up again, it will immediately unblock the port.
Two routers are connected together through a LAN to form a VRRP backup group. The configuration on each interface is as follows:
[RTA-GigabitEthernet1/0] display this
IP address 192.168.0.252 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
Vrrp vrid 1 priority 120 shut down.
[RTB-GigabitEthernet1/0] display this
IP address 192.168.0.253 255.255.255.0
Vrrp vrid 1 virtual-ip 192.168.0.254
What can we learn from the above information?
- A . Router RTA is in VRRP Master state, and router RTB is in VRRP Backup state.
- B . Router RTA is in VRRP Backup state, and router RTB is in VRRP Master state
- C . Router RTA is in VRRP Initialize state, and router RTB is in VRRP Master state
- D . Router RTA is in VRRP Master state, and router RTB is in VRRP Master state.
In the switching network shown in the figure, VLAN10 is set as Super VLAN on switch SWA, VLAN2 and VLAN3 are sub VLANs of VLAN10, port Ethernet1/0/3 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass; VLAN2~VLAN20 are created on switch SWB, port Ethernet1/0/4 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass. Check the Ethernet 1/0/3 port information on SWA, which of the following is the correct display?
- A . [SWA] display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP
PVID: 1
Mdi type: auto
Link delay is 0 （ sec ） Port link-type: trunk
VLAN passing: 1 （ default vlan ）， 2-3 ， 10 VLAN permitted: 1 （ default vlan ）， 2-4094 Trunk port encapsulation: IEEE 802.1q - B . [SWA] display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 （ sec ） Port link-type: trunk
VLAN passing: 1 （ default vlan ）， 2-3
VLAN permitted: 1 （ default vlan ）， 2-9 ， 11-4094 Trunk port encapsulation: IEEE 802.1q - C . [SWA] display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 (sec)Port link-type: trunk
VLAN passing: 1 (default vlan), 2
VLAN permitted: 1 (default vlan), 2-9, 11-4094 Trunk port encapsulation: IEEE 802.1q - D . [SWA] display interface Ethernet 1/0/3 Ethernet1/0/3 current state: UP ……
PVID: 1
Mdi type: auto
Link delay is 0 (sec)Port link-type: trunk
VLAN passing: 1 (default vlan), 2
VLAN permitted: 1 (default vlan), 2-4094
Trunk port encapsulation: IEEE 802.1q
When an IGMPV3 host wishes to leave multicast group G, it will actively send a Membership Report message containing the group record?
- A . TO_IN (A, G)
- B . TO_EX (A, G)
- C . TO_IN (Null, G)
- D . TO_EX (Null, G)
In the network connection shown in the figure, SWA and SWB are three-layer switches, running STP+VRRP, and after the initial configuration is completed, SWA is the root of STP and the master of VRRP, and SWC is the downlink access terminal of the two-layer switch. Which of the following description of the network link failure is correct?
- A . When the link between SWA and SWB is disconnected, the STP topology will change, and both uplink ports of SWC will become Forwarding
- B . When the link between SWA and SWB is disconnected, the VRRP Master will switch and SWB will become the new VRRP Master
- C . When the link between SWA and SWC is disconnected, the STP topology will change, and G1/0/2 of SWC will become Forwarding
- D . After the link between SWA and SWC is disconnected, the VRRP Master will remain unchanged, but the SWC downstream terminal will not communicate with the gateway.
The customer’s two switches SWA and SWB are connected together through seven Ethernet cables and configured with static link aggregation. The corresponding ports on switch SWA are Ethernet 1/0 Ethernet 1/0/2, Ethernet 1/0/3, Ethernet 1/0/4, Ethernet 1/0/5, Ethernet 1/0/6, and Ethernet 1/0/7. The configuration method is to configure in sequence according to the port order. If each aggregation group of switches SWA and SWB only supports 6 ports, then which of the following is right?
- A . When all ports are configured the same, Ethernet 1/0/1 is the Unselected port in the aggregation group.
- B . When the configuration of each port is consistent, SWA randomly selects one port from the seven ports as the Unselected port of the aggregation group.
- C . When all ports are configured the same, Ethernet 1/0/6 is the Unselected port in the aggregation group.
- D . When all ports are configured the same, Ethernet 1/0/7 is the Unselected port in the aggregation group.
Which of the following statements about STP bridge ID is correct?
- A . The bridge with the smallest bridge ID in the network will eventually become the root bridge after STP calculation.
- B . The bridge ID consists of the bridge MAC address and the priority field. When comparing bridge IDs, the MAC address is compared first, and the one with the smaller MAC address value is preferred.
- C . The MAC addresses of SWA and SWB are 00-E0-FC-00-00-11 and 00-E0-FC-11-00-11 respectively, and their priorities are 32768
and 4096, when SWA and SWB are connected in a ring network and the spanning tree protocol is enabled, SWA will become the root bridge. - D . The bridge priority field is 2 bytes long, so the bridge priority value range is 0-65535
Which request operation does SNMP v2c add compared to SNMP v1 protocol?
- A . GetRequest
- B . GetNextRequest
- C . GetBulkRequest
- D . SetRequest
In the switching network shown in the figure, VLAN 10 is set as the Super VLAN on the switch SWA, and VLAN2 and VLAN3 are sub VLANs of VLAN 10. VLAN, port Ethernet1/0/3 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass; VLAN2 and VLAN20 are created on switch SWB, port Ethernet1/0/4 is a Trunk port, PVID is VLAN1, and all VLANs are allowed to pass. After setting the IP addresses of each device as shown in the figure, you can judge which of the following is correct?
- A . PCC can communicate with PCB
- B . PCC can communicate with SWA
- C . PCC can communicate with SWB
- D . SWA can communicate with SWB
Which of the following statements about the intercommunication between Sub VLANs in Super VLAN technology is correct?
- A . The host IP addresses in different Sub VLANs belong to the same network segment, and they can communicate directly with each other through Layer 2 forwarding.
- B . The host IP addresses in different Sub VLANs belong to the same network segment, but due to the isolation of Sub VLAN, the Sub VLANs cannot communicate with each other.
- C . Hosts in different Sub VLANs are isolated at Layer 2, and can communicate at Layer 3 through the common proxy ARP technology of the Super VLAN interface.
- D . Hosts in different Sub VLANs are isolated at Layer 2, and can communicate at Layer 3 through the local proxy ARP technology of the Super VLAN interface.
The customer LAN switch SWA is connected to multiple switches. If it is known that the Monitor Link group is configured on SWA, the switch SWA has the following configuration information:
[SWA] monitor-link group 1
[SWA-mtlk-group1] port gigabitethernet 1/0/1 uplink
[SWA-mtlk-group1] port gigabitethernet 1/0/2 uplink
[SWA-mtlk-group1] port gigabitethernet 1/0/3 uplink
[SWA-mtlk-group1] port gigabitethernet 2/0/1 downlink
What can we learn from the above information?
- A . If the GigabitEthernet1/0/1 port is in the Down state, the GigabitEthernet 2/0/1 port will also be in the Down state.
- B . If the GigabitEthernet1/0/2 port is in the Down state, the GigabitEthernet 2/0/1 port will also be in the Down state.
- C . If the GigabitEthernet1/0/2 port is in the Down state, the GigabitEthernet 2/0/1 port will also be in the Down state.
- D . If the GigabitEthernet1/0/1 port is in the Up state, the GigabitEthernet 2/0/1 port will also be in the Up state.
The customer’s LAN switch SWA has dual uplink connections to switches SWB and SWC, and Smart Link is used to ensure link reliability. What can we learn from the above information?
- A . If the configuration of each port is consistent, you can select the SWA aggregation member port as the Smart Link port.
- B . If the configuration of each port is consistent, you can select the SWA RRPP member port as the Smart Link port
- C . If the configuration of each port is consistent, you can select the SWA STP member port as the Smart Link port
- D . None of the above answers are correct
Two switches SWA and SWB are connected together through four Ethernet cables, and the corresponding interfaces on switch SVVA have the following configuration:
[SWA-Ethernet1/0/1] display this duplex full
Speed 10
[SWA-Ethernet1/0/2] display this duplex full
Speed 10
[SWA-Ethernet1/0/3] display this duplex half
Speed 100
[SWA-Ethernet1/0/4] display this duplex half
Speed 100
What can we learn from the above information?
- A . Four Ethernet ports are added to the same aggregation group through static aggregation. The selected ports are Ethernet 1/0/1 and Ethernet 1/0/2.
- B . Four Ethernet ports are added to the same aggregation group through static aggregation. The selected ports are Ethernet 1/0/1 and Ethernet 1/0/3.
- C . Four Ethernet ports are added to the same aggregation group through static aggregation, and the Selected ports are all four ports.
- D . Four Ethernet ports are added to the same aggregation group through static aggregation. The selected ports are Ethernet 1/0/3 and Ethernet 1/0/4.
In BFD echo working mode, the other end needs to configure which of the following?
- A . No configuration is required
- B . Configure bfd demand enable on the interface
- C . Configure bfd echo enable on the interface
- D . Configure bfd session init-mode active in the system view
Which of the following is the multicast destination address of the Hello message in PIM?
- A . 224.0.0.9
- B . 224.0.0.5
- C . 224.0.0.13
- D . 224.0.0.21
The router IGMP protocol version can be configured which of the following in the view?
- A . User view
- B . System global view
- C . IGMP view
- D . Interface view
In a certain network, it is planned to use an S3610 switch as a RADIUS client and two IMC servers as RADIUS servers to complete user security authentication access.
Which of the following statements is correct?
- A . When configuring the S3610, the RADIUS server type that should be selected should be Extend.
- B . If the two IMC servers can adopt the master-slave mode, then the two RADIUS server IP addresses configured on the S3610 must be the same
- C . Two IMC servers cannot work in master-slave mode
- D . By default, the IP address of the RADIUS server on the S3610 is 192.168.1.1
Which of the following statements about IToIP is incorrect?
- A . IToIP closely connects applications and infrastructure, greatly improving the operating efficiency of IT systems.
- B . IToIP requires that IT systems be built using IP networks as infrastructure.
- C . Various IT resources can easily share and use standard IP infrastructure to achieve further integration of various technologies and applications such as communication, computing, storage, and networking.
- D . The IT system built on ITolP can create a standard, compatible, secure, intelligent and manageable IT application environment for users.
The router IGMP Snooping function must be enabled in which of the following view?
- A . System global view
- B . IGMP view
- C . User View
- D . VLAN view
The following information is the SNMP configuration on a certain H3C network device:
Snmp-agent
Snmp-agent local-engineid 800007DB0OEOFC79887C6877
snmp-agent sys-info version all
Snmp-agent group v3 h3c
Snmp-agent usm-user v3 h3c h3c
Which of the following description of the result of SNMP access to this device is correct?
- A . You can successfully access and configure this device through snmp v2c
- B . This device can be successfully accessed and configured via snmp v3
- C . This device can be successfully accessed and configured via snmp v1
- D . Regardless of the version, this device cannot be accessed or configured
In STP calculations, which parameters in the configuration BPDU may be used to determine the port role?
- A . Root ID, Root Path Cost, Bridge ID, Designate Port ID, Bridge Port ID
- B . BPDU Type, Root ID, Root Path Cost, Bridge ID
- C . Root ID, Root Path Cost, Bridge ID, Port ID
- D . Flags, Root Path Cost, Bridge ID, Port ID
Which of the request operations specified in the SNMP v1 protocol are atomic?
Atomicity means that failure of any variable in the request will cause failure of all variable operations in this request. (Select one or more)
- A . SetRequest
- B . GetRequest
- C . GetNextRequest
- D . There are no atomic operations
Regarding the description of Private VLAN technology and Super VLAN technology, which of the following is correct?
- A . Super VLAN technology is also called VLAN aggregation. Its main purpose is to solve the problem of IP address waste or insufficient VLAN interface quantity.
- B . Private VLAN is a Layer 2 VLAN technology, so switches that support Private VLAN technology are all Layer 2 switches.
- C . Super VLAN is a three-layer VLAN technology, so the switches that support Super VLAN technology are all three-layer switches.
A customer wants to deploy 802.1x in the local area network to improve access security. At the same time, the customer hopes to use the port security feature to temporarily close the port for 5 minutes when it receives illegal messages to prevent illegal users from accessing the network.
Which of the following features should be enabled on the device?
- A . ntk temporarily characteristics
- B . NeedToKnow feature
- C . InstrusionProtection Features
- D . Autolearm feature