正确答案: C

Router configuration-register set to bypass startup configuration

题目：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?

解析：解析：Explanation:

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学习资料的答案和解析：

[单选题]交换机工作在OSI七层模型的哪一层()

数据链路层

[单选题]工作在OSI第三层的设备是：()

路由器

[单选题]交换机上VLAN的功能描述中，正确的是（）

可以减少广播对网络性能的影响

[单选题]下列对RIP的配置中，合法的命令是（）

router rip network 10.12.0.0

[单选题]如果网络中的路由器都是cisco路由器，则优先选择哪一个路由协议（）

EIGRP

[多选题]在配置帧中继子接口时，在物理接口上应该配置的内容是：()

封装帧中继协议

指定子接口类型

设定子接口

解析：BCD

[单选题]You have just purchased a brand new router and wish to have the router prompt you through the initial configuration commands. Which router mode does this describe?

SETUP mode

解析：解析：Explanation:

[单选题]Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?

255.255.254.0

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?

Data link

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