单项选择题
A.showmount -e ServerName
B.vi /etc/exports
C.startsrc -g nfs
D.exportfs -i FileSystemName
单项选择题 AgatewaymachinehasaccesstotheInternetandistryingtoreachamachineontheInternetcalledcactus.org.Althoughthegatewaymachinecannotreachcactus.org，anothernetworkacrosstownisabletoreachcactus.org.Furthermore，thegatewaymachinecanreachthenetworkacrosstown，butcannotpingthecactus.org.Whichofthefollowingtoolswillbesthelpdiagnosethelocationoftheproblem？（）
单项选择题 Whichofthefollowinglocalfilesisusedtorunthedatecommandontheremotemachine"Earth"usingthefollowingrexeccommandwithoutrequestforapassword？rexecEarthdate（）。
单项选择题 AllofthefollowingcommandscouldbeusedtoverifyavailabilityofttydevicesonthesystemEXCEPT：（）。