Technology
How does a firewall protect a network?
A firewall protects a network by checking every piece of incoming and outgoing traffic against a set of rules, then allowing or blocking it. Like a security guard at a gate, it stops unauthorized or suspicious connections while letting safe traffic pass.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how a firewall works.
Step by step
- 1It inspects traffic entering and leaving a network.
- 2It allows or blocks based on security rules.
- 3It stops unauthorized or malicious connections.
- 4It's a frontline defense in network security.
Frequently asked questions
- How does a firewall work?
- It checks network traffic against rules and blocks anything unauthorized or suspicious while allowing safe traffic.
- What can a firewall block?
- Unwanted connections, known malicious addresses, suspicious ports, and traffic that breaks its rules.
- Is a firewall enough to stay secure?
- It's essential but not sufficient alone — it works best alongside antivirus, updates, and good practices.