单项选择题

Which one of the following is NOT a supported IKE attribute？（）

A. PFS group.
B. Encryption algorithm.
C. Hashing Algorithm.
D. Authenticationmethod.
E. Lifetime duration.

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单项选择题

With PGP， which of the following entity signs a users’s public key？（）

A. The sender of the message.
B. The receipient of the message.
C. The sender’s administrator who provides the sender with the PGP program.
D. A third party that belongs to what’s often known as "web of trust"， that can verify the relationship between the user and the key.
E. The vendor of the PGP program.

单项选择题

When configuring a multipoint GRE （mGRE） tunnel interface， which one of the following is NOT a valid configuration option：（）

A. tunnel source
B. tunnel destination
C. tunnel key
D. ip address
E. tunnelvrf

多项选择题

Which of the following statements that describe Diffie Hellman Key exchange are correct？（）

A. A DH key exchange is an algorithm that utilizes asymmetric cryptographic keys.
B. The DH key exchange is used to establish a shared secret over an insecure medium during an IPSec phase 1 exchange.
C. The DH exchange is susceptible to man-in-the-middle attacks.
D. The DH exchange is used to authenticate the peer device duringan IPSec phase 1 exchange.
E.A DH exchange provides Perfect Forward Secrecy （PFS）.