[单选题]当配置一个CISCO的路由器时，缺省的DR和BDR优先级是（）。

正确答案 ：B

1

[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

[多选题]交换机的三大功能为（）

正确答案 ：ABC

地址学习

转发过滤

消除回路

解析：ABC

[单选题]You need to perform. some initial configuration tasks on a new Ezonexam switch. What is the purpose of assigning an IP address to a switch?

正确答案 ：B

To allow remote management of the switch.

解析：解析：Explanation:Switchisalayer2deviceanddoesn'tusenetworklayerforpacketforwarding.TheIPaddressmaybeusedonlyforadministrativepurposessuchasTelnetaccessorfornetworkmanagementpurposes.

[单选题]After logging into a router and typing in a few show commands, you press the up arrow key. What will this do?

正确答案 ：A

It will recall the previous command line

解析：解析：Explanation:

[单选题]OSPF的度量值是什么()

正确答案 ：D

链路状态

[单选题]工作在OSI第三层的设备是：()

正确答案 ：B

路由器

[单选题]备份路由器IOS的命令是：()

正确答案 ：A

copy flash tftp

[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]能够分配给设备的IP，应该是（）

正确答案 ：A

网络有效IP

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