Stop Hackers at the Gate Firewalls in 5
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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.
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