What Is a Firewall? Ports, Rules, and Traffic Filtering
What Is a Firewall? Ports, Rules, and How Traffic Gets Filtered TL;DR — Key Takeaways A firewall is a security device or software that monitors and controls incoming and outgoing network traffic based on a predefined set of rules. Firewalls inspect packet headers — looking at source/destination IP addresses, port numbers, and protocols — to … Read more