Question

How many type firewall have in network

Posted on April 25, 2025
Networking
Asked by ba5051aeaa0246b89cc9151b4e3df7

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KFSys

Site Moderator

• April 28, 2025

Heya,

In networking, there are several types of firewalls:

Packet-Filtering Firewall
- Checks packets individually based on IP, port, and protocol.
- Very fast, but basic (can’t see inside packets).
Stateful Firewall
- Tracks the state of active connections (TCP handshake, etc.).
- Smarter than packet filtering, understands the context.
Application Layer Firewall (Proxy Firewall)
- Inspects traffic at the application level (HTTP, FTP, DNS).
- Can block specific requests or responses.
Next-Generation Firewall (NGFW)
- Combines stateful inspection + deep packet inspection + intrusion prevention.
- Also often supports SSL decryption, antivirus, etc.
Cloud Firewalls (like DigitalOcean Cloud Firewall)
- Managed firewall service in the cloud.
- Filters incoming and outgoing traffic without configuring the server directly.
Web Application Firewall (WAF)
- Specialized firewall to protect web apps.
- Blocks threats like SQL injection, XSS attacks.