An AIX system administrator wants to be able to monitor disk usage and to be able to control how much disk space can be used.  Which command is run to obtain the desired output?（）

单项选择题Therootidissetsothatdirectloginisdisabled.Informationmustbereviewedrelatingtowhenrootaccesswasobtained.Inwhichofthefollowingfilesisthisinformationlocated?（）

A. /var/adm/sulog 
B. /var/adm/wtmp 
C. /etc/security/user 
D. /etc/security/failedlogin

单项选择题To examine the Exhibit, press the Exhibit button. Using the information provided in the exhibit, which of the following options indicates when the SSA error occurred?（）

A. 12:28am on May 25,1999 
B. 12:28pm on May 25,1999 
C. 5:25am on December 28,1999 
D. 5:25pm on December 28,1999

单项选择题Whichofthefollowingproblemshasoccurredwhenamenuappearsandpromptstheuserto copyadumptoexternalmedia?（）

A. The external dump device is full. 
B. The dump device was set to /dev/hd7 before the dump happened. 
C. The boot failed while copying the dump from paging space to a file. 
D. The dump device was not set to a paging device before the dump happened.

单项选择题Afilenamed core existsinthecurrentdirectory.Whichofthefollowingcommandsshouldbeusedtodeterminewhatcreatedthe core file?（）

A. dump -t core 
B. strings core 
C. trace -a core 
D. crash core /unix_up

单项选择题Whichofthefollowingoptionsindicateswhyitisimportanttotalktotheuserandaskappropriatequestionsaboutasoftwareproblem?（）

A.Software problems don't generate errors. 
B.The user is more knowledgeable about software. 
C.The system logs will provide useful information alone. 
D.Key information pertaining to the software may be uncovered.