單項選擇題Which of these is the best way to provide sender non-repudiation?()

A. pre-sharedkey
B. secure hash
C. SSL
D. RSA signature


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1.單項選擇題What group in Cisco IOS does 1536-bit Diffie-Hellman prime modulus equivalent too?()

A. group 3
B. group 1
C. group 5
D. group 7

2.單項選擇題What are the header sizes for point-to-point and multi-point GRE(also known asmGRE) with tunnel key?()

A. 4 bytes for both
B. 4 bytes, and 8 bytes respectively
C. 8 bytes for both
D. 24 bytes for both

3.單項選擇題Which ones are the two type of ciphers?()

A. Blocking cipher andnon-blocking cipher
B. CBC cipher and EBC cipher
C. Block cipher and Stream cipher
D. Blocker cipher and Streamer cipher
E. 3DES cipher and AES cipher

5.單項選擇題For a router to obtain a certificate from a CA, what is the first stepof the certificate enrollment process?()

A. the router generates a certificate request and forwards it tothe CA
B. the router generates an RSA key pair
C. the router sends its public key to the CA
D. the CA sends its public key to the router
E. the CA verifies the identity of the router
F. the CA generates a certificate request and forwards it to the router

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