[单选题]下列哪一个通配符掩码与子网172.16.64.0/27的所有主机匹配（）。

正确答案 ：C

0.0.0.31

[单选题]VLAN主干协议VTP的默认工作模式是()

正确答案 ：A

服务器模式

[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.

[单选题]What kind of cable should be used to establish a trunked line between two Catalyst switches?

正确答案 ：E

A cross-over cable

解析：解析：Explanation: A crossover cable is used to connect two of the same device types, or devices from the same OSI layer.

[单选题]路由器“路由模式”的提示符号是（）

正确答案 ：D

(config-router)

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