For each blank, choose the best answer from the four choices and write down on the answer sheet. (66)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.
(66)is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(67)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.
(68)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.
(69)is a device used to connect two separate network that use different communication protocol.
(70)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
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