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全部科目 > 软件认证工程师考试 > 思科认证考试 > CCNA系列认证 > CCNA(640-553)

单项选择题

Which one is the most important based on the following common elements of a network design？（）

A.Business needs
B.Risk analysis
C.Security policy
D.Best practices

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单项选择题

Which Public Key Cryptographic Standards （PKCS） defines the syntax for encrypted messages andmessages with digital signatures？（）

A.PKCS #7
B.PKCS #8
C.PKCS #10
D.PKCS #12

单项选择题

Examine the following options，which Spanning Tree Protocol （STP） protection mechanism disables aswitch port if the port receives a Bridge Protocol Data Unit （BPDU）？（）

A.Uplink Fast
B.Port Fast
C.BPDU Guard
D.Root Guard

多项选择题

Observe the following options carefully， which two attacks focus on RSA？（）

A.BPA attack
B.Adaptive chosen ciphertext attack
C.DDoS attack
D.Man-in-the-middle attack

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