单项选择题
Which command can be used to verify that filesystems are being exported by a server？（）
A.showmount -e ServerName
B.vi /etc/exports
C.startsrc -g nfs
D.exportfs -i FileSystemName
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AgatewaymachinehasaccesstotheInternetandistryingtoreachamachineontheInternetcalledcactus.org.Althoughthegatewaymachinecannotreachcactus.org，anothernetworkacrosstownisabletoreachcactus.org.Furthermore，thegatewaymachinecanreachthenetworkacrosstown，butcannotpingthecactus.org.Whichofthefollowingtoolswillbesthelpdiagnosethelocationoftheproblem？（）
A.iptrace
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Whichofthefollowinglocalfilesisusedtorunthedatecommandontheremotemachine"Earth"usingthefollowingrexeccommandwithoutrequestforapassword？rexecEarthdate（）。
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单项选择题
AllofthefollowingcommandscouldbeusedtoverifyavailabilityofttydevicesonthesystemEXCEPT：（）。
A.lstty
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