单项选择题
A.tracert
B.ipconfig
C.netstat
D.nslookup
单项选择题 Asmallbusinesshashadunauthorizedpeopleentertheirserverroomanddamagetheirservers.WhichofthefollowinglocksforthedoorwouldBESTpreventunauthorizedpeoplefromaccessing theserverroom？（）
单项选择题 Atechnicianhasjustfinishedinstallinganewserverintoaserverrack.Whichofthefollowing shouldthetechniciandoNEXTtocompletetheinstallationdocumentation？（）
单项选择题 WhichofthefollowingserverrolesallowsaservertotranslatefullyqualifieddomainnamesintoIP addresses？（）