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在自治系统内部的各个路由器之间,运行的是内部网关协议IGP。早期的IGP叫做 (1) ,它执行 (2) 。当网络规模扩大时,该算法使得传送的路由信息太多,增加了网络负载,后来又出现了执行最短路径优先算法的IGP。按照这种协议,每个路由器向网络中的其他路由器发布 (3) ,当路由信息改变后,路由器按照 (4) 算法更新路由表。在不同自治系统的路由器之间,运行外部网关协议EGP,典型的EGP是 (5) 。 3()

A. 它连接的所有链路的状态信息
B. 它的路由表
C. 与它相邻的路由器的地址
D. 所有目标节点的URL

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For each blank,choose the best answer from the four choices and write down on the answer sheet.(1) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group.(2) is an error detection code that most data communication networks use.(3) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.(4) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non -periodic basis over a range of media.(5) is an identifier of a web page. 3()

A. OSPF
B. RIP
C. RARP
D. BGP

对一路信号进行频移键控(FSK)调制时,若载波频率为fc,调制后的信号频率分别为 f1和f2(f1<f2),则三者的关系是 (1) 。当对多路信号进行调制时,调制后各信号的频谱(2) 。信号到达接收端后通过 (3) 分离各路信号。WDM与FDM工作方式很相似,但WDM调制的是 (4) 。ILD是 (5) 使用的设备。 1()

A. fc-f1=f2-fc
B. f1*f2=fc
C. f2+f1=fc
D. f2-f1=fc

For each blank,choose the best answer from the four choices and write down on the answer sheet.(1) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group.(2) is an error detection code that most data communication networks use.(3) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.(4) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non -periodic basis over a range of media.(5) is an identifier of a web page. 5()

A. HTTP
B. URL
C. HTML
D. TAG

RSA是一种基于 (1) 原理的公钥加密算法。网络上广泛使用的PGP协议采用 RSA和IDEA两种加密算法组成链式加密体系,这种方案的优点是 (2) 。POP还可以对电子邮件进行认证,认证机制是用MD5算法产生 (3) 位的报文摘要,发送方用自己的 RSA私钥对 (4) 进行加密,附加在邮件中进行传送。如果发送方要向一个陌生人发送保密信息,又没有对方的公钥,那么他可以 (5) 。 4()

A. 邮件明文
B. IDEA密钥
C. 邮件明文和报文摘要
D. 报文摘要

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