Job Scheduling; mainly crontab, at, batch command
Backup stetegy; incremental, full system back up; diff between tar & ufsdump
diff between hard link & softlink
How to list only the directories inside a directory (Ans. ls -l|grep “^d”)
RAID levels; pros & cons of diffrent levels; what is RAID 1+0
How to recover a system whose root password has lost?
What [...]

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On a fresh install, why does Apache have three config files - srm.conf, access.conf and httpd.conf? - The first two are remnants from the NCSA times, and generally you should be ok if you delete the first two, and stick with httpd.conf.
What’s the command to stop Apache? - kill the specific process that httpd is [...]

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Difference between layer 2 and layer 3 devices?
What is VLAN?
What is the subnet for a class C network?
Are you familiar with automounter?
Have you configured an NIS server/client?
Have your configured a NFS server?
Windows and Linux interoperability how to?
What is RAID 1?

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How do you show the currently running queries? - SHOW FULL PROCESSLIST;
How do you kill a MySQL query? - See the ID of it from the question above, then KILL id. You can separate multiple IDs by space.
I need to find out how many client connections were aborted by MySQL server. - It’s displayed in [...]

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