Which command is used to turn ipforwarding on or off？（）

单项选择题Userscomplaintheycannotcommunicatewithaserver.ThesystemadministratorsuspectstheremaybeaproblemwiththeEthernetadapterorwiththewayitisconfigured.Whichcommandcanberuntoverifytheadapterisconfiguredcorrectly？（）

A.netstat -in
B.ifconfig -a
C.arp -a
D.cfgmgr

单项选择题WhatisthecorrectfastpathtoconfigureoraddaTTYTerminal（directlyfromthescreen），whichconnectstoaserialport？（）

A.smitty tty
B.smitty devices
C.smitty pty
D.smitty dev

单项选择题ForSLIPtowork，whatshouldthe EnableLogin valuebesettoonbothsystems？（）

A.Enable
B.Disable
C.Share
D.Delay

单项选择题Todisablealltcpipdeamonsthatarenotrequiredonaserver，whichofthefollowingfilesshouldbeedited？（）

A./etc/rc.nfs
B./etc/rc.tcpip
C./etc/rc.net
D./etc/inetd.conf

单项选择题A system administrator has created tty2 on a serial port connection to a system.  When attempting to verify the connection the following error is observed：   # cu -ml tty2   cu： 0835-028 The connection failed. NO DEVICES AVAILABLE. Which of the following should be performed to correct this error？（）

A.Create an entry for tty2 in the /etc/uucp/Devices file
B.Re-enter the command as "cu -dml tty2"
C.Create an entry for tty2 in the /etc/uucp/Systems file
D.Re-enter the command as "cu -s 9600 -dh -t -l tty2"