单项选择题
You work as a network engineer， do you know an IPsec tunnel is negotiated within the protection of whichtype of tunnel？（）
A.L2F tunnel
B.L2TP tunnel
C.GRE tunnel
D.ISAKMP tunnel
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Whichdescriptionaboutasymmetricencryptionalgorithmsiscorrect？（）
A.They use the same key for encryption and decryption of data.
B.They use different keys for decryption but the same key for encryption of data.
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单项选择题
Forthefollowingitems，whichonecanbeusedtoauthenticatetheIPsecpeersduringIKEPhase1？（）
A.pre-shared key
B.integrity check value
C.XAUTH
D.Diffie-Hellman Nonce
