Which of the following commands is used to clear all entries from the system error log? （）

单项选择题Whichfiledoestheerrptcommandpullitsinformationfrom?（）

A. /var/adm/ras/errlog 
B. /var/adm/ras/diag_log 
C. /var/adm/ras/bootlog
D. /var/adm/ras/devinst.log

单项选择题Duringaboot,whichofthefollowingproceduresismostlikelytopresentamenuthatpromptstheusertocopyadump?（）

A. Set the dump device to /dev/hd6. 
B. Run sysdumpdev to set the force copy flag for dump to true. 
C. Run sysdumpdev to set the force copy flag for dump to false. 
D. Increase space in the /tmp directory. 

单项选择题Asystemadministratorhasruntopasonaserver.Theoutputshowsthatthe%iowaitofthesystemis60%andthatmostofthediskactivityisonhdisk0.Whichofthefollowingproceduresshouldbeperformedtofixthisproblem?（）

A. Replace the hard disk with a faster disk drive. 
B. Add another paging space on another hdisk. 
C. Spread the data hdisk0 across several hdisks. 
D. Nothing, since %iowait is a measurement of CPU time.

单项选择题OnanewlyinstalledAIXV4machine,whichofthefollowingdefaultvaluesappliestotheipforwardingnetworkoption?（）

A. The ipforwarding is off by default. 
B. The ipforwarding is set on by default. 
C. The value is dynamically determined at boot time by DHCP. 
D. The value is equal to the setting of the directed_broadcast runtime attribute.

单项选择题WhichofthefollowingstatementsisTRUEabouttheprimarysystemdumpdevice?（）

A. It is shared. 
B. It must be /dev/hd6. 
C. It must be an internal disk. 
D. It can be an external device.