单项选择题

A. Kernel threadB. Too many usersC. Memory shortageD. N……

After running the vmstat command， which of the following would most likely cause the value in the blocked column to be unusually high？（）

A. Kernel thread
B. Too many users
C. Memory shortage
D. Network contention

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单项选择题Whichofthefollowingcommandsismostusefulininitiallycollectingdatatodetermineanetworkperformanceproblem？（）

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A. There is a file I/O bottleneck.
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