Maeve

Firewall definition is something that controls the flow of information between systems. It is a system or set of systems that protect computer networks from unauthorized access.

It is also a term used to describe the protective measures taken to prevent the spread of fire. Firewall is a component of an information security strategy.

There are many types of firewalls, but the three most common are packet filtering firewalls, proxy firewalls, and application level firewalls. The purpose of a firewall is to prevent unauthorized access to network resources.

Firewalls work by detecting and blocking traffic that is not authorized. Firewalls can be deployed on the perimeter of a network or inside the network.

A firewall can be divided into two categories: stateful and stateless. Stateful firewalls maintain a record of all the traffic that is encountered. This information is then used to determine whether or not to allow the traffic through the firewall.

Stateless firewalls do not maintain a record of the traffic that is encountered. Instead, they rely on heuristic rules to determine whether or not to allow the traffic through the firewall.

There are many different types of firewalls, but the three most common are packet filtering firewalls, proxy firewalls, and application level firewalls.