单项选择题
A.DHCP
B.DNS
C.IMAP4
D.Telnet
单项选择题 Whenoneconnectiontoahostfailsinafullmeshnetwork，whichofthefollowingistrue？（）
单项选择题 AuserconnectstothecompanysintranetserverviaaVPNconnectionfromasmalloffice/homeoffice（SOHO）usingthebroadbandservice.Oneday，theusercannotsuccessfullyconnecttotheVPNandreceivesanerrormessagethatstates"Usernameandpasswordareinvalidonthedomain."Whichofthefollowingshouldbedonetocorrectthisproblem？（）
单项选择题 WhichofthefollowingistrueregardingNetWareDirectoryServices（NDS）configuration？（）