Firewalls Guide 🔥🛡️

Control Network Traffic

1. What is a Firewall?

A firewall is a security system that monitors and controls incoming and outgoing network traffic.

2. Types of Firewalls

Network Firewall → Protects entire network
Host Firewall → Protects single system
Cloud Firewall → Used in AWS/GCP

3. Rules

Allow → Permit traffic
Deny → Block traffic
Port-based filtering
IP-based filtering

4. Example

Allow 80 → Website
Allow 443 → HTTPS
Block others

5. Linux Firewall (UFW)

sudo ufw enable
sudo ufw allow 22
sudo ufw allow 80
sudo ufw status

6. Benefits

- Prevent unauthorized access
- Protect servers
- Control traffic

7. Real Use Cases