A firewall is a security control that monitors and filters network traffic based on rules. Its job is to allow legitimate traffic and block unauthorized or suspicious traffic. There are two main uses: Network firewall: protects entire networks, often at the router or gateway Host-based firewall: runs on an individual computer or server What a firewall does: Blocks unwanted inbound connections Controls outbound traffic Enforces security policies Helps prevent unauthorized access Can log and alert on suspicious activity Common types: Packet-filtering firewall: checks IP addresses, ports, and protocols Stateful firewall: tracks active connections and makes smarter decisions Proxy firewall: acts as an intermediary between users and services Next-generation firewall (NGFW): adds deep packet inspection, intrusion prevention, app awareness, and threat intelligence Example: If someone on the internet tries to connect to your computer on a blocked port, the firewall can deny that traffic before it reaches the system. Basic rule example: Allow web traffic on ports 80 and 443 Block remote access on port 3389 from unknown IPs Why firewalls matter: Reduce attack surface Protect against scans and unauthorized access Support compliance and segmentation Add a layer of defense with antivirus, MFA, and monitoring They are important, but not enough by themselves. A firewall does not replace patching, endpoint protection, strong passwords, or user awareness.
A firewall is a security control that monitors and filters network traffic based on rules. Its job is to allow legitimate traffic and block unauthorized or suspicious traffic. There are two main us...
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