Which command can be used to verify that filesystems are being exported by a server？（）

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

单项选择题Whichofthefollowingcommandsgathersnetworkpacketstatistics？（）

A.netstat -i
B.ifconfig -a
C.errpt -a
D.iptrace -i