正确答案: C

测试TCP/IP协议是否正常

题目：命令“ping127.0.0.1”的功能是（）

解析：C

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学习资料的答案和解析：

[单选题]对于路由表，下列说法中正确的是：（）

在缺省的情况下，如果一台路由器同时运行了RIP和OSPF两种动态路由协议，则在路由表中只会显示OSPF发现的路由，因为OSPF协议的优先级更高

[单选题]当配置一个CISCO的路由器时，缺省的DR和BDR优先级是（）。

1

[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（）

这个列表是编号型标准ACL，检查进入接口的数据包

[单选题]帧中继环境中，CIR的含义是（）

保证线路速率

[单选题]下面对Cisco2621路由器和Cisco2501路由器描述中，错误的是（）

Cisco2501上提供一个100Mbit/s的快速以太网端口

[单选题]An administrator issues the show ip interface s0/0 command and the output displays that interface Serial0/0 is up, line protocol is up.What does "line protocol is up" specifically indicate about the interface?

Keepalives are being received on the interface.

解析：解析：Explanation:

[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.)

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]You are a systems administrator and you are about to assign static IP addresses to various servers on your network. For the network 192.168.20.24/29 the router is assigned to the first usable host address, while the last usable host address goes to your Sales server. Which one of the following commands would you enter into the IP properties box of the sales server?

IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway: 192.168.20.25

解析：解析：ExplanationAsubnetmaskuses29bits.Thismeansthatituses5bitsinthe4thoctet.Thisequatesto255.255.255.248.Thisnetworkhas3bitsforhosts.Usingthe2n-2formula(23-2)inthiscase),weareleftwith6(2*2*2-2=6)hostaddresses.192.168.20.24isthenetworkaddress.Thereforethenextaddress(192.168.20.25)wouldbethefirsthostaddress.Thisaddressmustbeassignedtotherouter,whichservesasthegatewayforthenetwork.Thelastavailablehostaddresswouldbe192.168.20.30(192.168.20.24+6).Thisaddressisassignedtotheserver.Thebroadcastaddressis192.168.20.31.