Let’s take example and set rules and learn how packet filtering firewall works. Packet Filters works on IP level it checks incoming data packet which contains SA(Source Address), Destination, Protocol and Port Numbers, Packet filtering operates on a set of firewall rules that restrict user-defined protocols, IP addresses, port numbers, which they continue to block until the rules are changed Basically it is a Network Filter which is filtering the packets being received and sending over the network if it matches the rules that allow packets to enter if not then it will discard the data packet.
There are several of Types of firewalls but we will discuss only 4 Types of firewalls which we will describe in the section below. Nowadays data security is very important tool of any small or big firm That keeps your data safe.Provide a Safety Wall between Private Network and the internet or public network.
For example you visit some xyz website and when you click on the website some cookies, unwanted pop-ups and advertisements come automatically if you click on it it can harm your network or Malware can attack your network through viruses That’s why we use firewall which prevents the network from unwanted traffics and unsafe packets which filters the packets and discards the malicious packets before entering your network.
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