Which DHCP allocation method allows automatic reuse of an address that is no longer needed by the client to which it was assigned？（）

单项选择题Ausercanpingeverythingonthelocalnetworkearth.netfromanAIXbox（whichislocatedonearth.net）.However，iftheusertriestopingsomethingonanothernetwork（mars.net）theusermusttypethefullyqualifiedhostname.WhatcantheuserdosothatthefullyqualifiedhostnamedoesnothavetobetypedeverytimetheuserwantstoaccessANYmachineonmars.net？（）

A、Edit the /etc/hosts file and add an alias to the correct entry
B、Set up an alias in his .kshrc file to alias the hostname to the fully qualified hostname
C、Add an alias to /etc/aliases
D、Add mars.net to the search path of the resolv.conf file

单项选择题Anapplicationoruserexperiencespoorperformance，yetexaminationofthenfsstat-coutputindicatesnoorveryfewtimeoutsandretransmits.Thismeansthattheclientisreceivingresponsesfromtheserverasfastasitisaskingforthem.Whatisthefirstthingtobechecked？（）

A.There is an appropriate number of NFS daemons running on the server machine
B.There is an appropriate number of biod daemons running on the client machine
C.The server is not CPU bound
D.There is an appropriate number of biod daemons running on the server machine

单项选择题ToenabletheSNMPdaemonduringsystemstartup，whichofthefollowingfilesshouldbemodified？（）

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

单项选择题Whereisthesendmail.pidfilekept？（）

A./
B./var/adm/ras
C./var/spool/mail
D./etc

单项选择题WhatisthelaststepinsettingupaPrimaryDomainNameServer？（）

A.Start the named daemon
B.Create the cache file
C.Create the name zone file
D.Create the local IP zone file