A recently installed package needs to be rolled back to aprevious version.
Which of the following commands will perform the task?（）

单项选择题A non-root user can run rsh commands from serverA to serverB, but attempts to run rsh commands by the root user return with apermission error message. What action will resolve the problem?（）

A.Add root user to the /etc/hosts.equiv on serverB
B.Create $HOME/.rhosts file for the root user on serverB
C.Restart the rshd daemon with root enabled option on serverB
D.Add entry to allow root user from serverA to the /etc/hosts.allow on serverB

单项选择题Which command restores files from a volume group backup on a specified media?（）

A.mksysb-r
B.savevg-r
C.restorevg-r
D.restorevg files

单项选择题Which port must be open on the HMC to allow remoteweb access？（）

A.22
B.80
C.443
D.8080

单项选择题Thepingloopbackhangswithnooutput.Whichofthefollowingisthemostlikelycause？（）

A.The loopback interface is down and resolv.conf is configured.
B.The loopback is not in /etc/hosts and resolv.conf is configured.
C.The loopback interface is down and resolv.conf is not configured.
D.The loopback is not in /etc/hosts and resolv.conf is not configured.

单项选择题Whatisthecorrectmethodfordeleting‘paging04’pagingspace？（）

A.swapoff paging04 rmps paging04
B.swapoff /dev/paging04 rmps paging04
C.swapoff paging04 rmps /dev/paging04
D.swapoff /dev/paging04 rmps /dev/paging04