Network Security / 3 min
What is a Firewall?
A firewall filters network traffic based on rules, trust zones, ports, protocols, and security policy.
Definition
A firewall is a security control that allows or blocks traffic based on configured rules. It can protect networks, hosts, and cloud environments.
Common uses
Firewalls are used to restrict inbound access, segment networks, limit risky outbound traffic, and enforce policy between trust zones.
Portfolio takeaway
Understanding firewall behavior helps me interpret scan results and explain why a service may or may not be reachable.