On a previous tutorial you have learnt some basis about firewalls, and on previous tutorial we have categorized firewalls into two types by their construction, now in this tutorial we are going to share some advance knowledge and we will categorize firewalls by their application.
How Firewalls Work
To understand the working of firewalls is not enough difficult as many people think. The working of firewall is depend on some steps.
When you start communicating to other computers or device over the Internet, your computers follow the TCP 3-way handshaking process, in general your computer send a request to the network for the sake of communication.
If you have a firewall on your computer, then first firewall check that request and compare it with different types of rules and regulation of the firewall.
Firewall also checking the source of networking and web-hosting and than firewall makes decision either file to be transfer or deny.
The rules and regulation of the firewall set by the administrator of the computer or a network.
Firewall also work on the authentication process for the safe communication, if some thing is missing in the authentication it will block the whole communication.
Firewalls can be divided by their configuration techniques or application.
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