正确答案: D

传输层

题目：OSI七层模型中，“段”是哪一层数据封装的名称（）

解析：D

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学习资料的答案和解析：

[单选题]常见的LSA有几种类型()

6

[单选题]TCP23是（）协议端口号；UDP69是（）端口号；TCP80是（）端口号。

TELNET TFTP HTTP

[单选题]在路由表中到达同一网络的路由有：静态路由、RIP路由、IGRP路由，OSPF路由，则路由器会选用哪条路由传输数据：()

静态路由

[单选题]为了阻止交换机环路，交换机上所采用的技术为（）

生成树协议

[多选题]在路由器上，可以使用的命令有：()

ping

show interfaces

show ip route

解析：ABC

[单选题]At which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?

Data link

解析：解析：Explanation:

[单选题]On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?

Combining routes to multiple networks into one supernet.

解析：解析：Explanation:

[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.