[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]工作在OSI第三层的设备是：()

正确答案 ：B

路由器

[单选题]在OSPF的完全存根区域中，使用以下哪种LSAType报文或其它方式与区域间通信：（）

正确答案 ：D

默认路由：0.0.0.0

[单选题]常见的LSA有几种类型()

正确答案 ：C

6

[多选题]CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)

正确答案 ：BD

To obtain the IP Address of a connected device in order to telnet to the device

To verify Layer 2 connectivity between two devices when Layer 3 fails

[单选题]You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:o/r 0x2142

正确答案 ：C

It is used to bypass the configuration in NVRAM.

解析：解析：Explanation:

[单选题]以下（）LSA类型是ASBR来宣告外部路由信息的。（）

正确答案 ：E

类型5

[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]The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?

正确答案 ：A

1 network with 254 hosts

解析：解析：Explanation:Asubnetwith24bitsonwouldbe255.255.255.0.SincethisisaclassCnetwork,thissubnetcanhaveonly1networkand254usablehosts.

[单选题]You wish to segment your LAN into multiple broadcast domains. Which technology method should you implement in order to do this?

正确答案 ：D

Virtual LANs

解析：D 解析：Explanation:

查看原题