linux / windows
how to check if rpm package is installed or not?
How to install and uninstall module?
how to check the bootscreen text?
how software gets installed in linux, windows..etc
how to edit the registry entry in windows using gui
Socket programming apis
TCP Connection establishment and close
traceroute ? how it works and whatis the meaning of stars ???
path MTU ...what is the purpose ?
TCP header format , flags, every thing
Port numbers again and again
Sliding window algorithm n how to solve the problem if rx is dropping the packet (manually set the limit)
SQL injection - every single time.....
How to test Nessus
Sudo code of sniffer
Perl - regular expression
fatching text and all that stuff...