Firewalls Explained in 60 Seconds – For Secure Web Hosting
A firewall is a system or group of systems that protects an organization’s computer network from attacks by hackers and malicious programs.
A firewall does this by inspecting all incoming data packets, checking whether they are allowed to enter the network according to pre-set security rules, such as those specifying which protocols are authorized for use on the network.
If unauthorized packets are detected, the firewall blocks them before they can damage any files or hardware attached to the network.
The inspection process is called packet filtering and it functions in different ways depending on what type of traffic is being inspected—e.g., TCP/IP traffic (the protocol most commonly used on today’s networks) or UDP/IP traffic (used for streaming video).
A firewall typically has two interfaces