2. 计算机
  3. For each blank, choose the best answer from the four choices and write down on the answer sheet. (71)is a one-way function that

For each blank, choose the best answer from the four choices and write down on the answer sheet. (71)is a one-way function that

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问题 For each blank, choose the best answer from the four choices and write down on the answer sheet.
(71)is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(72)is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(73)is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.
(74)is a device used to connect two separate network that use different communication protocol.
(75)is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
选项 A、NNI
B、NRZ
C、NAK
D、NVT
答案B
解析 MD(消息摘要)是一种单向函数，它能够接受一个任意长度的明文，并且根据此明文计算一个固定长度的字符串。
   NNTP是网络新闻传输协议，大部分USENET(网络新闻)机器都使用它来使新闻文章通过一条可靠的连接来从一台机器传送到另一台机器。
   HFC(Hybrid Fiber Coaxial，光纤同轴电缆混合网)是有线电视网供应商偏爱的一种方法。它是一种新型的宽带网络，采用光纤到服务区，而在进入用户的“最后1公里”采用同轴电缆。
   网关是一种将两个使用不同协议的、独立的网络连接在一起的设备。
   NRZ是一种数字到数字的两极编码方法，用其编码的信号级别不是正极就是负极。统一用TNR(反向不归零制)是数字数据传输的一种形式，用数字0和1表示二进位的低和高状态通过特殊的和持续的直流 (DC)电压传输。
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