An administrator wants to proactively collect information on attackers and their attempted methods of gaining access to the internal network. Which of the following would allow the administrator to do this？（）

单项选择题Whichofthefollowingwouldanattackerusetofootprintasystem？（）

A.RADIUS
B.Password cracker
C.Port scanner
D.Man-in-the-middle attack

单项选择题WhichofthefollowingtechnologiescanbeusedasameanstoisolateahostOSfromsometypesofsecuritythreats？（）

A.Intrusion detection
B.Virtualization
C.Kiting
D.Cloning

单项选择题WhichofthefollowingdescribesastaticNAT？（）

A.A static NAT uses a one to many mapping.
B.A static NAT uses a many to one mapping.
C.A static NAT uses a many to many mapping.
D.A static NAT uses a one to one mapping.

单项选择题WhichofthefollowingencryptionmethodsisoftenusedalongwithL2TP？（）

A.S/MIME
B.SSH
C.3DES
D.IPSec

单项选择题Whichofthefollowingspecifiesasetofconsistentrequirementsforaworkstationorserver？（）

A.Vulnerability assessment
B.Imaging software
C.Patch management
D.Configuration baseline