Final answer:
A firewall filters network connections based upon source, destination, and port. It acts as a barrier between an internal network and the external internet, controlling incoming and outgoing traffic.
Step-by-step explanation:
A firewall filters network connections based upon source, destination, and port. It acts as a barrier between an internal network and the external internet, controlling incoming and outgoing traffic.
For example, if an organization wants to block access to certain websites, it can configure the firewall to block outgoing connections to specific IP addresses or domain names. Additionally, firewalls can restrict access to specific network services like email or file sharing.
Firewalls are an essential security measure to protect against unauthorized access and potential threats on computer networks.