Which tool is based on the AIX trace facility？（）

单项选择题Whichofthefollowingcommandsshouldbeusedtotuneparametersofdevicesthataredisplayedwithlsattr？（）

A. chdev
B. cfgmgr
C. vmtune
D. schedtune

单项选择题Whichofthefollowingcommandsshouldbeusedtoidentifypacketsequenceproblems？（）

A. ping and arp
B. lsattr and ifconfig
C. netstat and iostat
D. iptrace and tcpdump

单项选择题InAIX5Landlater，theoperatingsystemsupportsthe procfilesystem.Whatwouldbethebestdescriptionofthe procfilesystem？（）

A. It is a pseudo filesystem that maps processes and kernel data structures to corresponding files.
B. It is a JFS mounted filesystem that provides an exact representation of what is happening to a proces at a single and discrete point of time.
C. It is a JFS mounted filesystem that maps processes and read-only files related to these processes.
D. It is a pseudo filesystem that contains data that represents the state of the parent processes （but not their threads） in a system.

单项选择题Whichcommandseriesshouldbeusedtodeterminewhetherfilepagingorpagingspacepagingisaproblemwhenrunningaprogramfromanidlesystem？（）

A. foo ； lsps -s
B. tprof -kx ； foo
C. iostat ； foo ； iostat
D. vmstat -s ； foo ； vmstat s

单项选择题Asystemadministratorwouldliketoresetstatisticstoinitialvaluespriortocollectingdevicestatisticsonent0interface.Whichofthefollowingcommandsshouldberuntoaccomplishthis？（）

A. netstat -v ent0
B. chdev -l ent0 -a reset=true
C. entstat -r ent0
D. Ethernet interface values cannot be reset