单项选择题

A.sarB.topasC.iostatD.vmstatPerformancemonitoringofapoo……

Performance monitoring of a poorly performing system indicates a high level of CPU usage. Which tool can be used to help identify which processes are using excessive CPU resources？（）

A.sar
B.topas
C.iostat
D.vmstat

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单项选择题Asystemadministratorreceivedthefollowingmessagewhiletryingtosshtoaserver：connectiontimedout.Theadministratorpingedtheserverandhadnoresponse.Theadministratorthenpingedthegateway，andwassuccessful.Whichtoolcouldtheadministratorusenexttoisolatetheproblem？（）

A.route
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