单项选择题

How can the administrator use file ’a’ containing ’-El sys0’ to view the attributes of a device（）？

A.lsdev -fv a
B.lsattr -f a
C.lsattr`cat a`
D.lsdev -Cccat a

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单项选择题

Which system provides redundant system clocks？（）

A.Power 595
B.Power 560
C.Power 570
D.Power 550

单项选择题

During an attempt to ’scp’ between two hosts， an error indicating PRNG is not seeded is displayed.What is the likely cause of the error？（）

A.The sshd user id is locked.
B.The /var/empty directory needs to be created.
C.PRNG is set to ’no’ in the /etc/ssh/sshd_config file.
D.The permissions on /dev/random and /dev/urandom are incorrect.

单项选择题

What must an administrator do to prevent new telnet users from connecting to the system？（）

A.rmdev -l /dev/pts
B.touch /etc/nologin
C.chdev -l sys0 -a nologin
D.chuser -a login=false ALL