单项选择题

Which of the following commands should be used to determine DNS name resolution performance？（）

A. iptrace
B. vmstat
C. hostname
D. ifconfig

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单项选择题

In an iostat report， which of the following options best describes the value of % idle？（）

A. A representation of the equation （tps/kbps）*100
B. The percentage of time the disks are idle with no activity
C. The percentage of time the disks are idle with no outstanding CPU requests
D. The percentage of time the CPU is idle with no outstanding disk I/O requests

单项选择题

Which of the following tools should be used to report current network status and is often used to check the reliability of a network？（）

A. netpmon
B. netstat
C. nfsstat
D. vmstat

单项选择题

Which of the following commands should be used to set network attributes on a currently running kernel？（）

A. no
B. chdev
C. vmtune
D. schedtune