[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]After connecting a PC to an available port on a switch, you find that the PC can not access any of the resources on the LAN. No other PC's connected to the switch appear to be having any issues. What is the most likely cause for this problem?
正确答案 ：B
The host switch port is assigned to the incorrect VLAN
解析：解析：Explanation:VirtualLANsbreakupbroadcastdomainsinalayer-twoswitchedinternetwork.IfahostisinadifferentVLANthenthenetworkservicesitneedstouse,thepacketsmustgothrougharouter.Ifroutingdoesnottakeplace,thePCwillbeunabletocommunicatewithanyotherdevicesnotinthesameVLAN.AnswerBisthebestanswerforthisquestion.IncorrectAnswers:A.ThePCisunabletocommunicatewithotherLANusers.Norouterneedstoevenbeinstalledforthistowork.C,E.TheMACaddressofthePCdoesnotneedtobeenteredmanuallyintotheswitch.TheswitchwilldynamicallylearnoftheMACaddressofthePC.D.TheSTPalgorithmdoesnotneedtohaveanyendhostinformationaddedinorderforittowork.
[单选题]IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的子网有效IP为（）
正确答案 ：C
192.168.50.65---192.168.50.70
[单选题]The Ezonexam network administrator has just issued the "switchport trunk native vlan 998" command on switch VE2. What is the function of this command?
正确答案 ：B
It designates VLAN 998 for untagged traffic
[单选题]基本IP访问权限表的表号范围是：()
正确答案 ：B
1-99
[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]对路由器的描述，正确的是（）
正确答案 ：C
多广播域，单冲突域的设备
[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]100baseT的速率是()Mbit/s
正确答案 ：C
100
[单选题]After working on a router, some problems arise and you wish to view the commands that you recently entered. Which IOS command opens the history buffer and displays the most recently entered commands?
正确答案 ：A
Show history
解析：A 解析：Explanation:
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