单项选择题
A. smpt.info /tmp/syslog.msgs B. mail.debug /tmp/syslog.msgs C. daemon.err /tmp/syslog.msgs D. mail.err /tmp/syslog.msgs
A. class B. tier C. shares D. limits
A. Check /etc/hosts. B. Check /etc/resolv.conf. C. Check for packet errors. D. Check to see if the master server is up.