How to ?

how to run a server as a deamon

Qualys Inc - Final Round

How to add a user in a linux machine?

How to check for the dependencies of a package?

SSH connection for the first time - Trusted Host ?
How to do it without prompting for a password
How SSH will store the keys at server side? How to add user ?
SSH as a root without password ?


md5 length and which algorithm it uses? how do u do it linux / windows

regex ! every time !!!!
How to fetch a name called any name containing patel from a text file
^[a-z]patel$
what is ^ and what is $
$ENV variable
CPAN and Object Oriented Perl

/etc/password content ?

where rpm packages are installed

how to add remove and force the older version of rpm package

nmap and nessus..how to give range and os fingerprinting option?

Version of each OS ?

Facebook Second Round - Telephonic

rc.conf ?

boot-screen messages ?

3 phase wire vs 1 phase ?

Qualys Inc - QA Intern interview questions

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

Networking

Socket programming apis
TCP Connection establishment and close
Socket APIs

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)

Security related

SQL injection - every single time.....

IP Governance
How to test Nessus

Programming

Sudo code of sniffer

Perl - regular expression
text substitution
fatching text and all that stuff...

Facebook - Pre screening round

1)How kill command works
2)Bootcode ?