A system administrator is monitoring a system that has recently shown a decrease in performance. The administrator suspects there is an overload of traffic on a single Ethernet adapter. Which of the following commands is best to identify a possible overload of the Ethernet adapter？（）

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

单项选择题A system administrator periodically receives calls from users who complain about poor performance with their application. Use the following sar command output to answer the question： Which of the following system resources need more investigation？（）

A.CPUs
B.Disk
C.Memory
D.NetworkX