单项选择题
A.showmount -e ServerName B.vi /etc/exports C.startsrc -g nfs D.exportfs -i FileSystemName
AgatewaymachinehasaccesstotheInternetandistryingtoreach...
单项选择题A gateway machine has access to the Internet and is trying to reach a machine on the Internet called cactus.org. Although the gateway machine cannot reach cactus.org， another network across town is able to reach cactus.org. Furthermore， the gateway machine can reach the network across town， but cannot ping the cactus.org. Which of the following tools will best help diagnose the location of the problem？（）
A.iptrace B.netstat C.tcpdump D.traceroute
Whichofthefollowinglocalfilesisusedtorunthedatecommando...
单项选择题Which of the following local files is used to run the date command on the remote machine "Earth" using the following rexec command without request for a password？ rexec Earth date（）。
A.~/ .rhosts B.$HOME/.netrc C./etc/hosts.equiv D./etc/security/user
Allofthefollowingcommandscouldbeusedtoverifyavailabilit...
单项选择题All of the following commands could be used to verify availability of tty devices on the system EXCEPT：（）。
A.lstty B.lscons C.lsdev D.lscfg
