单项选择题
A. ping RemoteHostName
B. ping RemoteHostIPaddr
C. nslookup RemoteHostName
D. ping lo0
单项选择题 Afterasystemhasrebootedfromasystemcrash,whichofthefollowingcommandsshouldberuntofindthelocationofthedump?（）
单项选择题 Asystemat192.100.45.17isabletoprinttotheprinter.However,anothersystemat192.100.50.23cannotprinttothesameprinter.AllofthefollowingshouldbeperformedEXCEPT:（）
单项选择题 Thefollowingentryhasbeenaddedtothesyslog.conffile:*.emerg;mail,daemon.crit@sysadminWhichofthefollowingwillresultfromthisentry?（）