OSI七层模型中，“段”是哪一层数据封装的名称（）

【名词&注释】

路由表(routing table)、路由器(router)、交换机(switch)、物理层(physical layer)、端口号(port number)、数据链路层(data link layer)

[单选题]OSI七层模型中，“段”是哪一层数据封装的名称（）

A. 物理层
B. 数据链路层^{(data link layer)}
C. 网络层
D. 传输层

查看答案&解析查看所有试题

学习资料：

[单选题]常见的LSA有几种类型()

A. 4
B. 5
C. 6
D. 7

[单选题]TCP23是（）协议端口号^{(port number)}；UDP69是（）端口号^{(port number)}；TCP80是（）端口号^{(port number)}。

A. TELNET FTP HTTP
B. FTPT FTP HTTP
C. TELNET TFTP HTTP
D. TELNET DNS 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：()

A. 静态路由
B. RIP路由
C. IGRP路由
D. OSPF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（）

A. 水平分割
B. 生成树协议
C. 触发更新
D. 地址学习

[多选题]在路由器上，可以使用的命令有：()

A. ping
B. show interfaces
C. show ip route
D. ipconfig
E. wincfg

[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?

A. Transport
B. Physical
C. Application
D. Data link
E. Network

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

A. Deleting unusable addresses through the creation of many subnets.
B. Combining routes to multiple networks into one supernet.
C. Reclaiming unused space by means of changing the subnet size.
D. Calculating the available host addresses in the AS.
E. None of the above

[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?

A. IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.9
B. IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway: 192.168.20.1
C. IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway: 192.168.20.25
D. IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.17
E. IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.25

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