Which of the following lines will be added to the file /usr/lib/uucp/Devices on the SLIP client machine for a SLIP connection on tty1？（）

单项选择题TheoptionsontheNFSserverusingthenfsocommandhavebeenadjusted.Whichofthefollowingtasksarerequiredinorderforthesechangestosurviveasystemreboot？（）

A.update /etc/rc.nfs
B.issue the chnfs command
C.recycle nfsd
D.unmount and remount the file systems

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