网络172.12.0.0需要划分子网，要求每个子网中有效IP数为458个，

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路由器(router)、帧中继(frame relay)

[填空题]网络172.12.0.0需要划分子网，要求每个子网中有效IP数为458个，为了保证子网数最大，则掩码应为（）

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[单选题]交换机上VLAN的功能描述中，正确的是（）

A. 可以减少广播域的个数
B. 可以减少广播对网络性能的影响
C. 可以减少冲突域的个数
D. 可以减小冲突域的容量

[单选题]路由器上端口fa0/0,其最大传输速率是（）Mbit/s

A. 128
B. 10
C. 100
D. 1000

[单选题]路由器“路由模式”的提示符号是（）

B. (config)
C. (config-if)
D. (config-router)

[单选题]为了连接“帧中继”线路，网络中的路由器需要提供的端口类型为（）

A. FastEthernet
B. Serial
C. BRI
D. Ethernet

[多选题]You need to describe the various types of flow control to your co-workers. Which of the following are types of flow control that can be used in a network? (Choose three)

A. Congestion avoidance
B. Windowing
C. Cut-through
D. Buffering
E. Load Balacing
F. F. Fast Forward

[单选题]A receiving host has failed to receive all of the segments that it should acknowledge.What can the host do to improve the reliability of this communication session?

A. Start a new session using UDP
B. Obtain a new IP address from the DHCP server
C. Use a different source port for the session
D. Decrease the sequence number
E. Decrease the window size

[单选题]The Ezonexam network administrator has issued the "VTP password ezonexam" command on a Cisco device. What is the purpose of this command?

A. It allows two VTP servers to exists in the same domain, each configured with different passwords
B. It is the password required when promoting a switch from VTP client mode to VTP server mode
C. It is used to access the VTP server to make changes to the VTP configuration
D. It is used to validate the sources of VTP advertisements sent between switches
E. None of the above

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