2022计算机类考试计算机四级历年考试试题汇总(3AE)

1. [单选题]In HDLC Protocol, when Supervisory Frame's type code is '00'.About the following statements, which is correct.

A. Receive Ready
B. Receive not Ready
C. Reject
D. Selective Reject

2. [单选题]以下关于无线网安全^{(wireless security)}协议WEP(Wired Equivalent Privacy)的描述中，哪项是不正确的?——

A. WEP使用RC4流加密协议
B. WEP支持端到端的加密和认证
C. WEP支持40位密钥和128位密钥
D. WEP是一种对称密钥机制

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