1 Diff btw S/w RAID & H/W RAID 

2 how would we find the system running in which shell using single command 

3 if DNS server down,how would we troubleshoot it

4 how would we make the process to sleep 

5 how would allow/deny particular websites in our 

network 

6 what is kernel compilation.explain briefly abt it 

7 how will we do the s/w patching & kernel patching 

8 difference btw script run by root user & ordinary user. 

9 what is linux testing 

10 is it accessible if we give any password for root after

 editing /etc/pam.d/login to optional 

11 anti virus s/w is in linux?
12 some clients were receiving their mails.now they cant
 receive .how to chk and rectify it.
 
thanks,
Velmurugan.S