正确答案: ADE

传输质量高 使用虚电路 专用线路

题目：网络中经常使用DDN服务，请选出DDN的优点（）

解析：ADE

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学习资料的答案和解析：

[单选题]当拓扑信息完成交换，相邻路由器具有相同的LSDB时，下列哪项OSPF邻居状态是希望得到的()

FULL

[单选题]关于OSPF中DR的说法不正确的是（）

如果某路由器优先级比DR优先级高，但启动晚，它会抢占原来的DR自己成为DR

[单选题]在启用IGRP协议时，所需要的参数是：()

自治系统号

[单选题]OSI七层模型中，“包”是哪一层数据封装的名称（）

网络层

[单选题]RIP路由协议认为“网络不可到达”的跳数是：()

16

[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]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?

100 meters

解析：解析：Explanation:

[单选题]From where does a small network typically get its IP network addresses or IP block?

From the Internet Service Provider (ISP)

解析：解析：Explanation:

[单选题]Study the Exhibit below carefully:London#show vtp

Forwards information about VTP configuration.

解析：解析：Explanation:FromtheoutputthisswitchisoperatingmerelyasVTPclient,soitbasicallydoesastheVTPserversays,andpassesoninformationaboutVTPconfigurationtothenextswitchinline.IncorrectAnswers:A.Thisisincorrectbecausethefunctionisredundant.B.ThisincorrectbecausetheswitchmustbeinserverortransparentmodetocreateandchangeVLANs.D.ThisisincorrectbecauseifVTPwouldbedisabled,itwouldn'tappearonthecommandoutput.E.Ifthisweretrue,theVTPconfigurationinformationwouldnotbedisplayedafterbeingpoweredon.