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问题 选择题

— _____ meat do you want?  

— Two kilos.  [ ]

A. How many        

B. How much        

C. How long

答案

答案：B

单项选择题

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.

66（）

A．MD

B．RSA

C．DES

D．MIB
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单项选择题

下面的安全攻击中不属于主动攻击的是______。

A．假冒

B．拒绝服务

C．重放

D．流量分析
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