正确答案: B

可以减少广播对网络性能的影响

题目：交换机上VLAN的功能描述中，正确的是（）

解析：B

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举一反三的答案和解析：

[多选题]Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)

The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.

The DHCP Discover message uses UDP as the transport layer protocol.

解析：A,B 解析：Explanation:

[单选题]以下（）LSA类型是ASBR来宣告外部路由信息的。（）

类型5

[多选题]You need to configure a default route on a Ezonexam router. Which command will configure a default route on a router?

VE1(config) ip route 0.0.0.0 10.1.1.0 10.1.1.1

VE1(config) ip default-route 10.1.1.0

VE1(config) ip default-gateway 10.1.1.0

VE1(config) ip route 0.0.0.0 0.0.0.0 10.1.1.1

解析：解析：Explanation:Thecommand"IProute0.0.0.00.0.0.0quot;$commandisusedtoconfigureadefaultrouteonarouter.Inthiscase,adefaultroutewithanexthopIPaddressof10.1.1.1wasconfigured.IncorrectAnswers:A.Thiswillbeaninvalidroute,sincethe"10.1.1.0"valuewillspecifythenetworkmask,whichinthiscaseisinvalid.B,C.Thesecommandsareinvalid.Thecommand"ipdefault-network"couldbeused,butnot"ipdefault-route"or"ipdefault-gateway".IPdefault-gatewayisusedonswitches,notrouters.

[单选题]为了使配置私有IP的设备能够访问互联网，应采用的技术是()

NAT

[单选题]“InsideGlobal”地址在NAT配置里表示的是什么()

一个注册的地址是表示一个内部的主机到外部网络

[单选题]标准访问控制列表应被放置的最佳位置是在（）。

越靠近数据包的目的地越好

[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:

[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?

Data link

解析：解析：Explanation:Asthequestionstatesthatseriallineisup,itmeanstheproblemisnotontheNetworklayer.Theadministratorcannotseeanyoutputbyissuingtheshowcdpneighborscommand.ItmeansthatCDPisdisabledandCDPisaprotocolthatrunsoverLayer2(thedatalinklayer)onallCiscorouters,bridges,accessservers,andswitches.