单项选择题

How does a system administrator add a new user to a system？（）

A.mkuser
B.cruser
C.adduser
D.edit /etc/password

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单项选择题

A user wants to be permanently added to the dba group. Which command or process can be used to accomplish this？（）

A.chgrp
B.chuser
C.setgroups
D.edit /etc/security/group

单项选择题

Due to operational commitments， a system has a very short backup window during the week， but is not used from Saturday morning through Sunday at Midnight. Which of the following minimizes backup time， while providing the best data restore coverage？（）

A.Full backups every night
B.Differential backups every night
C.Full backup Saturday night， incremental backups the rest of the week
D.Full backup Saturday night， differential backups the rest of the week

单项选择题

A system administrator performs a full backup every Saturday evening and incremental backups the rest of the week. The system failed on Thursday and needs to be restored. Which backup tapes will be required to restore the system to its most recent recoverable state？（）

A.Saturday’s full backup tape only
B.Wednesday’s incremental backup tape only
C.Saturday’s full backup and Wednesday’s incremental backup tapes
D.Saturday’s full backup and Sunday’s through Wednesday’s incremental backup tapes

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