A system administrator ran the iostat command because of system performance problems. The following iostat output is provided：

Based on the output， which of the following is insufficient？（）

单项选择题Asystemadministratorismonitoringasystemthathasrecentlyshownadecreaseinperformance.TheadministratorsuspectsthereisanoverloadoftrafficonasingleEthernetadapter.WhichofthefollowingcommandsisbesttoidentifyapossibleoverloadoftheEthernetadapter？（）

A.ping
B.iostat
C.netstat
D.ifconfig

单项选择题Asystemadministratorismonitoringasystemthathasrecentlyshownadecreaseinperformance.Theadministratorsuspectsthatthesystemmaybelowonmemoryandmaybepagingexcessively.Whichofthefollowingcommandsisbesttoidentifyapossiblepagingproblem？（）

A.iostat
B.netstat
C.ps
D.vmstat

单项选择题Whatcommandshouldasystemadministratorrunafterusinganeditortocreatethe etc tunables nextbootfile？（）

A.ksh -n nextboot
B.tunsave -a -f nextboot
C.tuncheck -r -f nextboot
D.diff $（vmtune） /etc/tunables/nextboot

单项选择题Whatstanzafiledoesasystemadministratorviewtodeterminewhatkernel-tuningparameterchangesweremadewhenthesystemwaslastbooted？（）

A./etc/rc.net
B./etc/tunables/tuning
C./etc/tunables/lastboot
D./usr/samples/kernel/nextboot

单项选择题An administrator attempted to run a sar -u report and received the following error：   sar： 0551-201 Cannot open  var adm sa sa07.   Which of the following should be scheduled in adm’s crontab to obtain sar reports？（）

A.sa1
B.sar
C.vmtune
D.schedtune