GB0-191-ENU

 The following statement about the functions of each layer of the OSI reference model is correct ______ . (Multiple choices)A . The session layer is responsible for data format processing and data encryption.B .  The basic function of the transport layer is to establish and maintain virtual circuits, perform error checking and flow control.C . The network layer determines...

 In the switching network shown in the figure, all switches have enabled the STP protocol. SWA was chosen as the root bridge. According to the information in the figure, the _______ port should be placed in the Blocking state. (Multiple choices)A . SWC 's P1B . SWC 's P2C . SWD of P1D . SWD 's P2E .  Insufficient information to judgeView AnswerAnswer:   BD Explanation: Bridge ID :...

 Which of the following statements about fiber optics are wrong ? (Multiple Choice)A .  Multimode fiber can transmit light with different wavelengths and different incident anglesB .  The core of multimode fiber is thinnerC .  When multimode fiber is used, the maximum transmission distance of the signal is longer than that of...

 The well-known port number of the transport layer used by TFTP is ______ .A . 67B . 68C . 69D . 53View AnswerAnswer:   C Explanation: TCP （ 6 ）： ftp――20/21 ssh――22 telnet――23 smtp-25 receive mail pop3-110 send mail DNS――53 http―― 80 https-443 http security version, add ssl layer below UDP(17) ： DNS――53 Bootp――67 server / 68 client (that is dhcp , dhcp is developed based on bootp )...

The hub ( Hub ) works in the ______ of the OSI reference model .A .  Physical layerB .  Data link layerC .  Network layerD .  Transport layerView AnswerAnswer:   A

WLAN ( Wireless LAN ) is the product of the combination of computer network and wireless communication technology. Which of the following are WLAN technical standards ? (Multiple choice)A . 802.11aB . 802.11bC . 802.11cD . 802.11gView AnswerAnswer:   AB Explanation: Maximum transmission rate

 Which of the following advantages does the OSI reference model have ? (Multiple Choice)A . The OSI reference model provides compatibility and standard interfaces between devices and promotes standardization.B . The OSI reference model is a theoretical description of the information transmission process that occurs between network devices and defines how to implement each layer of function...

WLAN ( Wireless LAN ) is the product of the combination of computer network and wireless communication technology. Which of the following are WLAN technical standards ? (Multiple choice)A . 802.11aB . 802.11bC . 802.11cD . 802.11gView AnswerAnswer:   AB Explanation: Maximum transmission rate

 During the establishment of the TCP connection as shown in the figure , the X part of the SYN should be filled with ________ . A . aB . bC . a+1D . b+1View AnswerAnswer:   C Explanation: X = a + 1 (confirm receipt of a , expect to send a + 1 next time ) Y = a + 1 Z = b + 1 (Confirm receipt b )

In the network environment shown in the figure , perform the following NAT configuration on RTA : [RTA]acl number 2000 [RTA-acl-basic-2000]rule 0 permit source 100.0.0.0 0.0.0.255 [RTA-acl-basic-2000]nat address-group 1 200.76.28.11 200.76.28.11 [RTA] interface Ethernet0 / 1 [RTA-Ethernet0/1]nat outbound 2000 address-group 1 After configuration, client_a and Client_B are accessing Server , at this time RTA 's NAT table may be ______ .A . Protocol    GlobalAddr       Port       InsideAddr      Port DestAddr         Port...