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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

多項(xiàng)選擇題

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