单项选择题
Which DHCP allocation method allows automatic reuse of an address that is no longer needed by the client to which it was assigned？（）
A.Automatic
B.Dynamic
C.Reuse
D.Manual
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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 -
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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
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ToenabletheSNMPdaemonduringsystemstartup，whichofthefollowingfilesshouldbemodified？（）
A./etc/rc.net
B./etc/rc.nfs
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D./etc/inetd.conf
