2. 计算机
  3. (71) is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.

(71) is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.

admin2010-01-24  58
问题 (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是一种单向的在利用任意长度的文本来计算固定长度的字符串的功能；NNTP是一种非常流行的新闻机制协议，现在我们利用它通过可靠的连接传播新的文章；HFC是一种更受有线电视提供商欢迎的接入方法，利用这种方法，光纤中止于广电转换器，最后一段通过共享式同轴电缆传输；网桥是一种用来连接两个采用了不同通信协议的网络的设备；非零编程(NRZ)是一种数字编码技术，在它的编码中要么正电平要么负电平。
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