Which of the following commands should be used to show DNS information？（）

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

单项选择题While monitoring a system that is CPU bound， which of the following output is most likely to occur？（）

A.A
B.B
C.C
D.D

单项选择题Whichofthefollowingcommandsshouldbeusedtoreportstatisticsonnetworkprotocolsusedbythesystem？（）

A. lsattr
B. pstat
C. netstat
D. ifconfig

单项选择题Whichofthefollowingtoolsshouldbeusedtoanalyzetheplacementoffilefragmentsonamirroredlogicalvolume？（）

A. df
B. lslv
C. filemon
D. fileplace

单项选择题Whichofthefollowingcommandsshouldbeusedtoshowthepercentageoftimethatanygivendiskwasbusy？（）

A. ps
B. tprof
C. iostat
D. vmstat