[单选题]After working on a router, some problems arise and you wish to view the commands that you recently entered. Which IOS command opens the history buffer and displays the most recently entered commands?

正确答案 ：A

Show history

解析：A 解析：Explanation:

[单选题]为了阻止交换机环路，交换机上所采用的技术为（）

正确答案 ：B

生成树协议

[单选题]TELNET工作在OSI哪一层（）

正确答案 ：D

应用层

[单选题]下列路由协议中，属于链路状态路由协议的是（）

正确答案 ：D

OSPF

[单选题]You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into router VE1 locally using a terminal emulation program such as HyperTerminal.

正确答案 ：B

Connect the PC's COM port to the router's console port using a rollover cable.

解析：B 解析：Explanation:

[多选题]In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

正确答案 ：CD

Forwarding

Learning

解析：解析：Explanation:

[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)

正确答案 ：ABD

Congestion avoidance

Windowing

Buffering

[单选题]两个VLAN之间要想通信，应该使用的设备是（）

正确答案 ：C

路由器

[单选题]关于帧中继的说法，正确的是（）

正确答案 ：C

可以偷占带宽

[单选题]以下（）LSA类型是ASBR来宣告外部路由信息的。（）

正确答案 ：E

类型5

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