Which of the following commands should be used to identify packet sequence problems？（）

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

单项选择题WhichofthefollowingcommandsshouldbeusedtoshowDNSinformation？（）

A. trace
B. netstat
C. ifconfig
D. nslookup

单项选择题Whenmonitoringasystemusingvmstatwithaninterval，themetricsunderpageporepresentwhichofthefollowingphrases？（）

A. The number pages over the limit
B. The pages to paging space per second
C. The number of page operations per second
D. The number of processes waiting for page out