正确答案: D

Data link

题目：At which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?

解析：解析：Explanation:

查看原题

举一反三的答案和解析：

[单选题]A new Ezonexam switch is installed into an existing LAN and a new VTP trunk is set up with an existing switch. Which VLANs will be allowed on this new trunk?

All defined VLANs are allowed on the trunk by default.

解析：解析：Explanation:

[单选题]网关的功能（）

不同网段通信

[单选题]路由器“特权模式”的提示符是：（）

[多选题]网络中经常使用“帧中继”服务，请选出帧中继的优点（）

偷占带宽

提供拥塞管理机制

灵活的接入方式

解析：ABD

[单选题]关于静态NAT，下面（）说法是正确的。

静态NAT将内部地址一对一静态映射到内部全局地址

[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.