单项选择题
A.Protocol analyzer
B.Vulnerability scanner
C.Port scanner
D.Penetration test
单项选择题 Anadministratorwantstoproactivelycollectinformationonattackersandtheirattemptedmethodsofgainingaccesstotheinternalnetwork.Whichofthefollowingwouldallowtheadministratortodothis？（）
单项选择题 Whichofthefollowingwouldanattackerusetofootprintasystem？（）
单项选择题 WhichofthefollowingtechnologiescanbeusedasameanstoisolateahostOSfromsometypesofsecuritythreats？（）