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.
单项选择题 WithPGP，whichofthefollowingentitysignsausers’spublickey？（）
单项选择题 WhenconfiguringamultipointGRE（mGRE）tunnelinterface，whichoneofthefollowingisNOTavalidconfigurationoption：（）
多项选择题 WhichofthefollowingstatementsthatdescribeDiffieHellmanKeyexchangearecorrect？（）
