题目内容
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（）
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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（）
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（）
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（）
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. 2（）
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