What Is PC Firewall?

1. What is a firewall?

A firewall is software or hardware that checks information coming from the Internet or a network, and then either blocks it or allows it to pass through to your computer, depending on your firewall settings.

A firewall can help prevent hackers or malicious software (such as worms) from gaining access to your computer through a network or the Internet. A firewall can also help stop your computer from sending malicious software to other computers.

2. What does a firewall do?

A firewall examines all traffic routed between the two networks to see if it meets certain criteria. If it does, it is routed between the networks, otherwise it is stopped. A firewall filters both inbound and outbound traffic. It can also manage public access to private networked resources such as host applications. It can be used to log all attempts to enter the private network and trigger alarms when hostile or unauthorized entry is attempted. Firewalls can filter packets based on their source and destination addresses and port numbers. This is known as address filtering. Firewalls can also filter specific types of network traffic. This is also known as protocol filtering because the decision to forward or reject traffic is dependant upon the protocol used, for example HTTP, ftp or telnet. Firewalls can also filter traffic by packet attribute or state.

3.Types of a firewall?

 Basically there are two types of firewall..

01.Hardware Firewall

02.Software Firewall

01.Hardware Firewall:You can Get an idea about Hardware firewall from this pic :)

02.Software Firewall: See this pic.. U will understand what is Software firewall :D

Why U need a Firewall??

01.Hacking into your computer through open ports   

        

02.Disguising hacking as harmless network interactions on your computer   

        

03.Scanning your computer for ports and security holes that can be hacked into   

        

04.Spoofing programs to create fake versions that can be used in an attack #   

   

   

05.Installing unknown spyware that sends your data (account numbers, passwords, etc.) to hackers   

   

   

06.Installing rootkits that give the hacker hidden access to your computer   

   

   

07.Taking control of a good program (by code injection) for theft, downloading viruses, etc.

In a Word,for Ur Personal security u need a firewall :)

So u should turn ur Firewall on if it is off :)

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