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What is a firewall?

hi all
i want to know what a fire wall is?
usha :confused:
Feb 8 '06 #1
3 2631
Niheel
2,452 Expert Mod 2GB
Hi Usha,

Hope the following definition helps you out.

A firewall is a hardware or software solution to enforce security policies. In the physical security analogy, a firewall is equivalent to a door lock on a perimeter door or on a door to a room inside of the building - it permits only authorized users such as those with a key or access card to enter. A firewall has built-in filters that can disallow unauthorized or potentially dangerous material from entering the system. It also logs attempted intrusions.

~ KUB
Thanks for joining our community!
Feb 8 '06 #2
What I like most in firewalls is that they allow to see all outbound connections , so even if you have a trojan/virus on your PC, you will see it as soon as it tries to go to Internet.
Jun 12 '06 #3
sashi
1,754 Expert 1GB
hey Little Buddha,

chek out the link below.. what Cross has explained is true n clear.. in case you need more details.. give it a try..

http://www.google.com.my/search?hl=e...ition&ct=title
http://www.netfilter.org/
http://www.tldp.org/HOWTO/Firewall-HOWTO.html

good luck my fren..
Jun 19 '06 #4

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