In the 802.11 frame, what type of frame does the STA ‘s association request and authentication request belong to?
- A . Data frame
- B . Control frame
- C . Management frame
- D . Data frames, control frames, and management frames all have this function
Which of the following aspects are the technical advantages of 802.11n compared to 802.11a/b/g?
- A . The maximum theoretical transfer rate is increased to 600Mbps
- B . Backward compatible with 802.11a/b/g protocol
- C . Support MIMO technology
- D . The other three items are correct
Which of the following standards organizations implements WLAN technology interoperability for WLAN equipment certification?
- A . WiFi Alliance
- B . IEEE
- C . IETF
- D . FCC
The CAPWAP protocol is a WLAN standard proposed by the IEEE standard organization in April 2009, and is used for communication between the AC and the thin AP.
- A . True
- B . False
How many channels does China support in the 2.4GHz frequency band?
- A . 11
- B . 13
- C . 3
- D . 5
Which of the following options belongs to the 5GHz frequency band supported?
- A . 5.15~5.25GHz
- B . 5.25~5.35GHz
- C . 5.725~5.825GHz
- D . 5.725~5.850GHz
Which modulation method does the picture below belong to?
- A . AM
- B . FM
- C . Phasing
- D . Modulation
What is the name of the first radio communication network based on packet technology?
- A . INTERNET
- B . ARPANet
- C . ALOHNET
- D . NSFnet
How many channels can the 2.4 GHz frequency band be divided into?
- A . 14
- B . 13
- C . 11
- D . 3
What is the 2.4 GHz band U.S. non-overlapping channel?
- A . 2, 7, 12
- B . 3, 8, 13
- C . 1, 6, 11
- D . 3, 7, 13
What is the distance between the center frequencies of each channel in the 2.4 GHz band?
- A . 20 MHz
- B . 22 MHz
- C . 5 MHz
- D . 10 MHz
What is the bandwidth of each channel in the 802.11g frequency band?
- A . 25 MHz
- B . 20 MHz
- C . 50 MHz
- D . 22 MHz
Which of the following protocols can support both the 2.4GHz frequency band and the 5GHz frequency band?
- A . 802.11a
- B . 802.11b
- C . 802.11g
- D . 802.11n
What is the range of working frequency stipulated in 2.4 GHz band?
- A . 2.4GHz-2.4835GHz
- B . 2.471GHz-2.497GHz
- C . 2.4465GHz-2.4835GHz
- D . 2.445GHz-2.475GHz
The basic service set is the basic component of the 802.11 network, which is composed of a group of workstations communicating with each other.
- A . True
- B . False
BSSID is actually the MAC address of the AP, which is used to identify the BSS managed by the AP.
- A . True
- B . False
Which of the following is a wireless local area network standard originally formulated by IEEE?
- A . IEEE 802.11
- B . IEEE 802.10
- C . IEEE 802.12
- D . IEEE 802.16
Huawei AP products can only support one SSID configuration.
- A . True
- B . False
WDS technology improves the flexibility and convenience of the entire network structure, but it can only support the point-to-point working mode.
- A . True
- B . False
What is the name of SSID?
- A . Basic service set
- B . Essential service area
- C . Extended service set
- D . Service Set ID
An infrastructure mode network consisting of multiple APs and the distributed systems connecting them, also known as which one?
- A . Basic service set
- B . Essential service area
- C . Extended service set
- D . Expanded service area
Which of the following AP modes does not belong to the WDS network?
- A . Root AP
- B . Middle AP
- C . Bridge AP
- D . Leaf AP
What is a network composed of a wireless AP and associated wireless clients called?
- A . IBSS
- B . BSS
- C . ESS
- D . NSS
If a BSS is completely composed of STAs, what is the name of the BSS?
- A . IBSS
- B . ESS
- C . SSID
- D . BSA
Mesh networking is defined in which of the following protocols?
- A . 802.11a
- B . 802.11g
- C . 802.11e
- D . 802.11s
What is the area covered by a single AP called?
- A . BSA
- B . ESA
- C . SSA
- D . TSA
The full name of BSS is Basic Service Set. BSS can be divided into Independent BSS and Infrastructure BSS.
- A . True
- B . False
Which of the following technologies belongs to wireless metropolitan area network?
- A . 2G/3G
- B . WLAN
- C . Bluetooth
- D . WiMAX
If the wireless client wants to connect to the WLAN through the AP, what does it use to connect to the wireless network?
- A . SSID
- B . IBSS
- C . BSID
- D . BSA
In WLAN, the AP has been working in the half-duplex state.
- A . True
- B . False
In 1999, the IEEE 802.11a standard was formulated, which stipulated that the working frequency band of wireless local area network was 5.15-5.825GHz, and the data transmission rate reached 11Mbps.
- A . True
- B . False
Unlike the 802.11a/b/g standard, the 802.11n protocol is a dual-frequency working mode (supporting two working frequency bands of 2.4GHz and 5GHz).
- A . True
- B . False
802.11b supports () channels in the United States, of which () channels do not overlap.
- A . 14, 3
- B . 11, 3
- C . 11, 6
- D . 14, 6
What is the maximum rate supported by the original 802.11 protocol in Mbps?
- A . 1
- B . 2
- C . 5.5
- D . 11
What is the working frequency band used by the original 802.11 protocol?
- A . 2.4 GHz
- B . 900MHz
- C . 2.0 GHz
- D . 5 GHz
Which of the following options is the maximum rate supported by the 802.11g protocol?
- A . 11Mbps
- B . 22Mbps
- C . 54Mbps
- D . 108Mbps
Which technology is used to implement the 802.11a protocol?
- A . FHSS
- B . DSSS
- C . OFDM
- D . MIMO
What type of frame () does the ACK frame belong to in WLAN?
- A . Management frame
- B . Control frame
- C . Data frame
- D . Empty data frame
What is the parameter used to check the integrity of the received frame in the 802.11 frame?
- A . Frame Control
- B . Duration
- C . FCS
- D . Sequence Control Bits
What parameters are used in 802.11 frames to reassemble frame segments?
- A . Frame Control
- B . Duration
- C . Address bit
- D . Fragment number
What frame does the passive scanning of the wireless client obtain the surrounding wireless network information?
- A . Beacon frame
- B . Probe Request frame
- C . Authentication frame
- D . Association Request frame
What frame does the wireless client actively scan to obtain the surrounding wireless network information?
- A . Beacon frame
- B . Probe Request frame
- C . Authentication Request frame
- D . Association Request frame
There are four wireless STAs. According to the following back-off time parameters, which workstation is the priority to occupy the channel?
- A . 5
- B . 7
- C . 4
- D . 6
What is the mandatory wireless LAN security standard?
- A . WiFi
- B . WAPI
- C . WLAN
- D . WiMAX
CAPWAP protocol was proposed by which of the following standard organizations?
- A . FCC
- B . IETF
- C . CCC
- D . ETSI
ETSI is the standard organization of which country or region?
- A . China
- B . The United States
- C . Japan
- D . Europe
The point-to-point wireless bridge can be used to connect two networks located in different places. In the wireless backbone connection, Root AP and Leaf AP should be set to different channels.
- A . True
- B . False
In a WDS network, a Root AP can connect to multiple Leaf APs, but a Leaf AP can only connect to one Root AP.
- A . True
- B . False
In the WDS network, what is the name of the AP that is connected to the AC by wire?
- A . Leaf AP
- B . Middle AP
- C . Master AP
- D . Root AP
The 802.11 physical layer standard defines some common operations of the wireless network at the physical layer: such as QoS, security, roaming and other operations.
- A . True
- B . False
Barker code is an 11-bit sequence (for example, 10110111000), which has advantages in wireless transmission and can effectively reduce interference, but reduces efficiency.
- A . True
- B . False
802.11b is a protocol based on Orthogonal Frequency Division Multiplexing (OFDM for short) technology.
- A . True
- B . False
The 802.11n standard uses dual frequency bands (2.4GHz and 5GHz), the theoretical transmission rate can reach up to 300Mbps, and the actual test rate can reach more than 100Mbps.
- A . True
- B . False
The modulation methods adopted by DSSS are BPSK and QPSK respectively.
- A . True
- B . False
Spread-spectrum (spread-spectrum) technology is the basis for transmitting wireless data using the ISM frequency band.
- A . True
- B . False
In a point-to-multipoint networking environment, one device acts as the central device, and all other devices only establish wireless bridges with the central device to realize the interconnection of multiple networks. The disadvantage is that the intercommunication of multiple branch networks must pass through the central bridge device for data forwarding.
- A . True
- B . False
Because the maximum rate supported by 802.11a is the same as that supported by 802.11g, the 802.11a protocol is backward compatible with the 802.11g protocol.
- A . True
- B . False
Which of the following rates is not supported by the 802.11a protocol?
- A . 6Mbps
- B . 12Mbps
- C . 24Mbps
- D . 30Mbps
A company wants to deploy WLAN. The company purchased a batch of wireless APs that support 802.11n. After the WLAN is deployed, only wireless clients that support 802.11n can connect to the company’s WLAN.
- A . True
- B . False
In the 802.11 frame, the value used to record the network allocation vector (NAV) is?
- A . Frame Control
- B . Duration
- C . address bits
- D . Sequence Control Bits
In the 802.11 frame, which address bit of the Address bit represents the address of the frame receiving end?
- A . Address 1
- B . Address 2
- C . Address 3
- D . Address 4
In the 802.11 frame, what is the correct correspondence between Type and frame format in the Frame Control bit?
- A . When Type is 01, it means data frame
- B . When Type is 10, it means control frame
- C . When Type is 00, it means reserved
- D . When Type is 00, it means management frame
In the 802.11 frame, when the wireless workstation sends a signal to the wireless AP, what are the values of To DS and From DS?
- A . 0, 0
- B . 0, 1
- C . 1, 0
- D . 1,1
In the 802.11 frame, when the network uses the WDS model for signal transmission, what are the values of To DS and From DS?
- A . 0, 0
- B . 0, 1
- C . 1, 0
- D . 1,1
In 802.11, which has the longest interval between frames?
- A . SIFS
- B . IFS
- C . DIFS
- D . PIFS
If the AP is working in the infrastructure mode, then the working state of the AP at this time is full-duplex mode.
- A . True
- B . False
If a wireless client is connected to two APs with the same SSID, what is used to determine which wireless AP the wireless terminal is connected to?
- A . SSID
- B . ESSID
- C . BSSID
- D . BSA
If a wireless client connected to the same SSID wants to roam from one AP to another, what is the range of signal overlap between the two APs?
- A . 50%
- B . Does not need to overlap
- C . 100%
- D . 10%-15%
In the 802.11 frame, what kind of control message should the terminal send to obtain access to the wireless medium?
- A . RTS
- B . CTS
- C . ACK
- D . PS-Poll
In the 802.11 frame, which message is used for the terminal to receive data packets in power saving mode?
- A . RTS
- B . CTS
- C . ACK
- D . PS-Poll
In the 802.11 frame, what is the interframe interval between RTS and CTS?
- A . SIFS
- B . IFS
- C . DIFS
- D . PIFS
When a data frame is sent and confirmed, what is the time interval before the next data frame is sent?
- A . SIFS
- B . IFS
- C . DIFS
- D . PIFS
In the WDS point-to-point network, the backbone link between the Root AP and the Leaf AP is connected using the 5GHz frequency band. The frequency band used by the Root AP is 149, so which of the following frequency bands should the Leaf AP use?
- A . 149
- B . 153
- C . 157
- D . All except 149
MIMO (Multiple input and multiple output), that is, multiple input and multiple output, wireless access points and clients using 802.11n technology can use up to three spatial streams to transmit data at the same time, and the theoretical rate can reach up to 600Mbps.
- A . True
- B . False
What are the rates supported by 802.11a?
- A . 6, 12, 24, 54 Mbps
- B . 6, 9, 12, 18, 24, 36, 48, 54 Mbps
- C . 6, 12, 18, 24, 36, 48, 54 Mbps
- D . 6, 9, 12, 18, 24, 30, 36, 48, 54 Mbps
What are the rates supported by 802.11g?
- A . 1, 2, 5.5, 11&6, 9, 12, 18, 24, 30, 36, 48, 54 Mbps
- B . 6, 9, 12, 18, 24, 36, 48, 54 Mbps
- C . 1, 2, 5.5, 11&6, 9, 12, 18, 24, 36, 48, 54 Mbps
- D . 6, 9, 12, 18, 24, 30, 36, 48, 54 Mbps
How many subcarriers can be used to transmit data in 802.11n 20M mode?
- A . 48
- B . 52
- C . 54
- D . 56
How many subcarriers can be used to transmit data in 802.11a in 20M mode?
- A . 48
- B . 52
- C . 54
- D . 56
If an 802.11n AP supports 2*2 MIMO technology, what is the theoretical rate of this AP?
- A . 150 Mbps
- B . 300 Mbps
- C . 450 Mbps
- D . 600 Mbps
Huawei’s box-type wireless controller AC6605 supports 24 PoE interfaces, and can directly supply power to APs connected to ACs in WLAN networking.
- A . True
- B . False
In the process of the thin AP discovering the AC, the first step is that the AP checks whether there is a pre-configured static AC IP list.
- A . True
- B . False
If the AP wants to obtain the IP address of the AC through the DNS server, it must first obtain its own IP address, DHCP Server and DNS IP addresses.
- A . True
- B . False
In WLAN networking configuration, what command must be executed on AC6605 to deliver the configuration to AP1?
- A . save ap id 1
- B . commit ap 1
- C . save ap 1 config
- D . save config ap 1
Which of the following commands can configure the port of the Huawei switch to hybrid mode?
- A . swichport hybrid
- B . hybrid enable
- C . port link-type hybrid
- D . port mode hybrid
To create a user for Huawei’s AC, first use the aaa command to enter the view.
- A . True
- B . False
The upgrade operation of Huawei wireless controller AC6605 can only be performed on the wired side of the controller.
- A . True
- B . False
The MEth0/0/1 interface of AC6605 is used for in-band network management, the default address is: 192.168.1.1/24, and it cannot be modified.
- A . True
- B . False
To upgrade the AP through FTP, you need to ensure that the AP and the FTP server can communicate with each other, and put the AP upgrade file in the FTP root directory.
- A . True
- B . False
Huawei AP6310AP is an outdoor AP that can support WDS function and realize point-to-multipoint wireless bridging function.
- A . True
- B . False
Telnet is one of the ways to remotely manage APs. It can be configured to implement telnet authentication based on username and password.
- A . True
- B . False
What is the command for Huawei AC6605 to switch between the wired side and the wireless side?
- A . Ctrl+B
- B . Ctrl+X
- C . Ctrl+Y
- D . Ctrl+Z
What is the command to check online users on AC?
- A . display users all
- B . display user-interface console 0
- C . display local-user
- D . display access-user
Which of the following is the command to restart AC6605?
- A . <Quidway> reload
- B . <Quidway> reboot
- C . [Quidway] reload
- D . [Quidway] reboot
Regarding the telnet management of AC6605, which of the following statement is wrong?
- A . Telnet is a method for remote management of AC
- B . The telnet service is disabled by default on the AC
- C . The telnet service can be configured separately on the wired side and the wireless side of the AC
- D . Telnet can be authenticated based on user name and password, and the transmission is encrypted, so it is quite safe
Huawei wireless controller AC6605 supports user access security management through security templates, and supports four security policies: WEP, WPA/WPA2, and WAPI.
- A . True
- B . False
If you change the configuration parameters of the AP radio frequency, you must restart the AP before the command can take effect.
- A . True
- B . False
What is the recommended AC-ID () for Huawei wireless controllers when configuring enterprise network WLAN services?
- A . cmcc (China Mobile)
- B . ctc (China Telecom)
- C . cuc (China Unicom)
- D . other (other)
Which of the following statement about SSID is wrong?
- A . Multiple different SSIDs can be released on one AP
- B . The same SSID can be released on multiple APs
- C . There is no limit to the number of SSIDs that can be configured on an AP
- D . Two sets of antennas of an AP can release the same SSID signal
What is the VLAN which used to establish a CAPWAP tunnel VLAN for AP and AC?
- A . Management VLAN
- B . Service VLAN
- C . User VLAN
- D . Authentication VLAN
eSight network management is Huawei’s dedicated network management platform, but it can only manage Huawei’s own equipment.
- A . True
- B . False