Question

what is firewall and its role in networking​

Answer 1

A firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or a combination of both. Firewalls prevent unauthorized internet users from accessing private networks connected to the internet, especially intranets.

Answer 2

The first step in finding the right firewalls to protect your company's data is to know what kind of firewalls there are. Right now, there are five different types of firewall architectures, broadly speaking: Packet-filtering firewalls. Stateful inspection firewalls.