多项选择题
A.They must have a trusted SSL certificate
B.They can be authoritative
C.They cannot be load-balanced
D.They can be recursive
E.They require DHCP
单项选择题 AnewservermustbeconfiguredtoprovidefaulttolerantconnectivitytotheDMZandthebackend database.WhichofthefollowingistheMOSTcosteffectivewaytoaccomplishthis？（）
多项选择题 WhenpurchasingaUPSforaserverroom，whichofthefollowingareimportantfactorsto consider？（）
单项选择题 Typically，warrantyinformationcanbefoundonavendor’swebsitebylookingupwhichofthe following？（）