[单选题]路由器上,命令“show int s0”的显示结果为:Serial0 is up,line protocol is down出现该结果的可能原因是()
正确答案 :C
两端设备协议不一致
[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]OSI七层模型中,传输层的数据封装名称为()
正确答案 :D
段
[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]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]路由器“特权模式”的提示符是:()
正确答案 :B
[单选题]帧中继环境下,为了区分虚电路,应该使用的地址是()
正确答案 :C
DLCI
[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]OSI七层模型中,“包”是哪一层数据封装的名称()
正确答案 :C
网络层
[多选题]You are bringing up a new Ezonexam switch, and wish to connect it via a trunk to another switch from a different vendor, which uses the IEEE standard for the trunking method. When setting the encapsulation type on the trunk, what should you configure on the Cisco switch?
正确答案 :ABCDE
Switch(config) switchport trunk encapsulation isl
Switch(config) switchport trunk encapsulation ietf
Switch(config-if) switchport trunk encapsulation isl
Switch(config-if) switchport trunk encapsulation ietf
Switch(config-if) switchport trunk encapsulation dot1q
解析:解析:Explanation:
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