DHCP协议的功能是(40)。在Linux中提供DHCP服务的程序是(41)； DHCP服务将主机的MAC地址和IP地址绑定在一起的方法是在(42)文件中添加"host主机名{hardware Ethernet xx.xx.xx.xx.xx.xx fixed-address 192.168.0.9}"配置项；创建 DHCP租用文件的命令是(43)；通过运行(44)命令可以设置在操作系统启动时自动运行DHCP服务。

(38)

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In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.

 Open Shortest Path First(OSPF)is a(71)routing algorithm that(72)work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires(73)processing power. The(74)algorithm is used to calculate routes. OSPF routing table updates only take place when necessary,(75)at regular intervals.

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(30)

Packet-switching wireless networks are preferable(66)when transmissions are(67)bemuse of the way charges are(68)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(69)for the(70)of time they use the network.