单项选择题
A.employ NIS to synchronize user names and passwords
B.create a /.rhosts on server A and serve B
C.create a $HOME/.netrc for all users on server A and serve rB
D.create a /etc/hosts.equiv on server A and server B
单项选择题 Thefollowingentryisinthe/etc/host.equivand/home/jsmith/.rhostsfileonserverAlpha：+jsmith.Whatdoesthisentryindicate？（）
单项选择题 Howcanthesystemadministratordetermineifasystemisrunningin32-bitor64-bitmode？（）
单项选择题 Whichofthefollowingactionswillenable64-bitapplicationsonasystemwitha32-bitkernel？（）