The options on the NFS server using the nfso command have been adjusted.  Which of the following tasks are required in order for these changes to survive a system reboot？（）

单项选择题Whichcommandcanbeusedtoverifythatfilesystemsarebeingexportedbyaserver？（）

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？（）

A.iptrace
B.netstat
C.tcpdump
D.traceroute

单项选择题Whichofthefollowinglocalfilesisusedtorunthedatecommandontheremotemachine Earth usingthefollowingrexeccommandwithoutrequestforapassword？rexecEarthdate（）。

A.~/ .rhosts
B.$HOME/.netrc
C./etc/hosts.equiv
D./etc/security/user

单项选择题AllofthefollowingcommandscouldbeusedtoverifyavailabilityofttydevicesonthesystemEXCEPT：（）。

A.lstty
B.lscons
C.lsdev
D.lscfg

单项选择题Whatisthepurposeof etc uucp Devices？（）

A.Defines permissions for remote machines contacting the local machine through BNU
B.Specifies dialer and modem types for uucp connections
C.Defines basic communication parameters
D.Assigns alternate or additional Systems， Devices and Dialers files