TryHackMe — Firewall Fundamentals | Cyber Security 101 (THM)

A firewall acts like a security guard for digital devices and networks, checking all incoming and outgoing data. Just as a physical guard prevents unauthorized people from entering a building, a firewall filters network traffic based on set rules, allowing or blocking data as needed. Firewalls today offer more than basic filtering, providing additional protection against unauthorized access.

Learning Objectives

1. Types of firewalls
2. Firewall rules and components
3. Hands-on practice with Windows and Linux built-in firewalls

Answer the questions below

1. Which security solution inspects the incoming and outgoing traffic of a device or a network?

• Firewall

Firewalls are categorized based on functionality and the OSI layer they operate on:

1. Stateless Firewall: Operates on OSI layers 3 and 4, filtering packets based solely on rules without considering prior connection states. This makes them quick but less secure for complex policies.
2. Stateful Firewall: Also operates on layers 3 and 4, tracking previous connections in a state table, allowing more secure filtering based on connection history.
3. Proxy Firewall: Works at OSI layer 7, acting as an intermediary for network requests, inspecting packet contents, and providing content filtering and…