单项选择题
Which of the following would an attacker use to footprint a system？（）
A.RADIUS B.Password cracker C.Port scanner D.Man-in-the-middle attack
单项选择题 WhichofthefollowingtechnologiescanbeusedasameanstoisolateahostOSfromsometypesofsecuritythreats？（）
单项选择题 WhichofthefollowingdescribesastaticNAT？（）
单项选择题 WhichofthefollowingencryptionmethodsisoftenusedalongwithL2TP？（）
