单项选择题
In an L2TP voluntary tunneling scenario， the VPDN tunnel is terminated between：（）
A. The client and the NAS. B. The NAS andthe LNS. C. The NAS and the LAC. D. The client and the LNS.
单项选择题 WhichoneofthefollowingisNOT asupportedIKEattribute？（）
单项选择题 WithPGP，whichofthefollowingentitysignsausers’spublickey？（）
单项选择题 WhenconfiguringamultipointGRE（mGRE）tunnelinterface，whichoneofthefollowingisNOTavalidconfigurationoption：（）
