Glossary
Firewall
A firewall is like a bouncer for your network. It checks everyone trying to get in or out and only lets through traffic that's on the approved list. Suspicious visitors get blocked at the door. Most computers have a built-in software firewall, and businesses often add a hardware firewall for extra protection.
What is Firewall?
A firewall is a security system that monitors and controls incoming and outgoing network traffic based on predefined rules. It acts as a barrier between trusted internal networks and untrusted external networks like the internet, blocking unauthorized access while permitting legitimate traffic.
Why Should You Care?
Firewalls are your first line of defense against external attacks. They block most automated attacks and scanning attempts. However, firewalls need to be properly configured and updated - a misconfigured firewall is like a bouncer who lets everyone in.
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Real-World Example
A small business's firewall was set to allow all outbound traffic by default. When an employee's computer was infected with malware, it freely communicated with the attacker's servers, sending stolen data out without any alerts. Proper outbound filtering would have blocked this communication and triggered an alert.
How to Protect Against Firewall
- 1.
Ensure Windows Firewall is enabled on all computers
- 2.
Consider a hardware firewall for your business network
Ubiquiti or pfSense
- 3.
Keep firewall firmware updated
- 4.
Review firewall rules quarterly - remove unnecessary open ports
- 5.
Enable logging and review for suspicious activity
- 6.
Don't expose management interfaces to the internet
Related Terms
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