What is a Firewall?

Asalam o alikum brothers and sisters, today we will learn what is a firewall?

In layman’s terms, a firewall simply consists of a list of permit and deny statements that determine which traffic is allowed and which is blocked.

Complete definition is as follows.

A firewall is a network security system which actively monitors, filters, and controls incoming and outgoing network traffic based on predetermined security rules

It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet.

The primary purpose of a firewall is to establish a security perimeter that helps prevent unauthorized access to or from a network.

Types of Firewalls

Firewall’s come built in as a software service in operating systems like Windows , linux etc and as a Hardware. Let’s discuss both in detail.

Now let’s look at the working of Firewalls. There are numerous variants or operating methods of Firewalls.

Overall, firewalls are a critical component of network security, helping organizations protect their systems and data from unauthorized access, cyber attacks, and other security threats.