[单选题]通配符掩码和子网掩码之间的关系是（）。

正确答案 ：A

两者没有什么区别

[单选题]交换机转发数据到目的地依靠()

正确答案 ：B

MAC地址表

[单选题]哪个命令可以成功测试网络：()

正确答案 ：B

Routerping192.5.5.30

[单选题]介质100BaseT的最大传输距离是：()

正确答案 ：B

100m

[单选题]把访问权限表应用到路由器端口的命令是：()

正确答案 ：B

ip access-group 101 out

[单选题]路由器上的命令“show version”的功能是（）

正确答案 ：A

显示版本信息

[单选题]默认情况下，RIP定期发送路由更新的时间是（）

正确答案 ：B

30S

[单选题]路由器当前的模式为“端口模式”，要退回到“特权模式”，应该使用的快捷键为（）

正确答案 ：B

ctrl+z

[单选题]After working all night and successfully configuring a Cisco router for the Ezonexam network you save your changes on the startup config, reboot the router, and go out for a cigarette. When you return, none of your changes are active and the router boots to the initial configuration mode! Which of the choices below indicates the source of your problem?

正确答案 ：C

Router configuration-register set to bypass startup configuration

解析：解析：Explanation:

[单选题]A Ezonexam technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the show cdp neighbors command.In which OSI layer is the problem most likely occurring?

正确答案 ：B

Data link

解析：解析：Explanation:Asthequestionstatesthatseriallineisup,itmeanstheproblemisnotontheNetworklayer.Theadministratorcannotseeanyoutputbyissuingtheshowcdpneighborscommand.ItmeansthatCDPisdisabledandCDPisaprotocolthatrunsoverLayer2(thedatalinklayer)onallCiscorouters,bridges,accessservers,andswitches.

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