【名词&注释】
路由器(router)、交换机(switch)、客户端(client)、物理层(physical layer)、是什么(what is)、优先选择(priority selection)、数据链路层(data link layer)
[单选题]You want to upgrade the Ezonexam LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?
A. Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides a point-to-point link
B. Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive
C. Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
D. Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal
E. None of the above
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[多选题]As the Ezonexam network administrator, you are required to have a firm understanding of the OSI model. Why does the data communication industry use the layered OSI reference model? (Choose two)
A. It enables equipment from different vendors to use the same electronic components, thus saving research and development funds
B. It encourages industry standardization by defining what functions occur at each layer of the model
C. It divides the network communication process into smaller and simpler components; thus aiding component development, design and troubleshooting
D. It provides a means by which changes in functionality in one layer require changes in other layers
E. It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers
[单选题]如果网络中的路由器都是cisco路由器，则优先选择(priority selection)哪一个路由协议（）
A. RIP
B. EIGRP
C. IGRP
D. OSPF
[单选题]地址转换NAT的优点是()
A. 地址转换对于报文内容中含有有用的地址信息的情况很难处理
B. 地址转换可以缓解地地址短缺的问题
C. 地址转换不能处理IP报头加密的情况
D. 地址转换由于隐藏了内部主机地址，有时会使网络调试变得复杂
[单选题]You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into router VE1 locally using a terminal emulation program such as HyperTerminal.
A. Connect the PC's COM port to the router's console port using a straight-through cable.
B. Connect the PC's COM port to the router's console port using a rollover cable.
C. Connect the PC's COM port to the router's Ethernet port using a straight-through cable.
D. Connect the PC's Ethernet port to the router's Ethernet port using a rollover cable.
E. Connect the PC's Ethernet port to the router's Ethernet port using a straight- through cable.
F. F. None of the above
[单选题]交换机工作在OSI七层模型的哪一层()
A. 物理层
B. 数据链路层(data link layer)
C. 网络层
D. 传输层
[单选题]“InsideGlobal”地址在NAT配置里表示的是什么()
A. 这个概括地址是所有的内部子网地址
B. 一个注册的地址是表示一个内部的主机到外部网络
C. 一个全局唯一，私有的ip地址被分配给一个内网的主机
D. 路由器的MAC地址被用做内部主机去连接这个互联网
[单选题]VLAN主干协议VTP的默认工作模式是()
A. 服务器模式
B. 客户端模式
C. 透明模式
D. 以上三者都不是
[多选题]Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)
A. The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.
B. The DHCP Discover message uses UDP as the transport layer protocol.
C. The DHCP Discover message uses a special Layer 2 multicast address as the destination address.
D. The DHCP Discover message uses TCP as the transport layer protocol.
E. The DHCP Discover message does not use a Layer 2 destination address.
F. F. The DHCP Discover message does not require a transport layer protocol.
[单选题]The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?
A. 1 network with 254 hosts
B. 4 networks with 128 hosts
C. 2 networks with 24 hosts
D. 6 networks with 64 hosts
E. 8 networks with 36 hosts
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