[单选题]PPP工作在OSI的哪一层（）
正确答案 ：B
数据链路层
[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
[多选题]What are two results of entering the VESwitch(config)# vtp mode client command on a Catalyst switch in the Ezonexam LAN? (Choose two.)
正确答案 ：BC
The switch will forward VTP summary advertisements
The switch will process VTP summary advertisements
解析：解析：Explanation:Servermode:VTPservershavefullcontroloverVLANcreationandmodificationfortheirdomains.AllVTPinformationisadvertisedtootherswitchesinthedomain,whileallreceivedVTPinformationissynchronizedwiththeotherswitches.Bydefault,aswitchisinVTPservermode.NotethateachVTPdomainmusthaveatleastoneserversothatVLANscanbecreated,modified,ordeleted,andVLANinformationcanbepropagated.Clientmode:VTPclientsdonotallowtheadministratortocreate,change,ordeleteanyVLANs.Instead,theylistentoVTPadvertisementsfromotherswitchesandmodifytheirVLANconfigurationsaccordingly.Ineffect,thisisapassivelisteningmode.ReceivedVTPinformationisforwardedouttrunklinkstoneighboringswitchesinthedomain,sotheswitchalsoactsasaVTPrelay.Transparentmode:VTPtransparentswitchesdonotparticipateinVTP.Whileintransparentmode,aswitchdoesnotadvertiseitsownVLANconfiguration,andaswitchdoesnotsynchronizeitsVLANdatabasewithreceivedadvertisements.InVTPversion1,atransparent-modeswitchdoesnotevenrelayVTPinformationitreceivestootherswitches,unlessitsVTPdomainnamesandVTPversionnumbersmatchthoseoftheotherswitches.InVTPversion2,transparentswitchesdoforwardreceivedVTPadvertisementsoutoftheirtrunkports,actingasVTPrelays.ThisoccursregardlessoftheVTPdomainnamesetting.
[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
[单选题]After working all night and successfully configuring a Cisco router for the Ezonexam network you save your changes on the startup config, reboot the router, and go out for a cigarette. When you return, none of your changes are active and the router boots to the initial configuration mode! Which of the choices below indicates the source of your problem?
正确答案 ：C
Router configuration-register set to bypass startup configuration
解析：解析：Explanation:
[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]Assuming you build networks to exact specifications, what is the recommended maximum length a 10BaseT cable can be before it has to be segmented or repeated?
正确答案 ：A
100 meters
解析：解析：Explanation:
[多选题]Which three statements are true about the operation of a full-duplex Ethernet network, which is being used in the Ezonexam LAN? (Choose three)
正确答案 ：BCE
The host network card and the switch port must be capable of operating in full-duplex mode.
There are no collisions in full-duplex mode.
A dedicated switch port is required for each full-duplex node.
解析：解析：Explanation:
[单选题]当在一个接口上使用ipaccess-group99in命令时，以下哪条关于所引用访问控制列表的描述是正确的（）
正确答案 ：C
这个列表是编号型标准ACL，检查进入接口的数据包
[单选题]When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?
正确答案 ：D
when every operating switch port is in either the blocking or forwarding state
解析：解析：Explanation:
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