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Firewall

2:19

5 Types of Firewalls

2:10

Firewall Trailer HD

1:54

What is a Firewall?

3:29

How firewalls work | Network firewall security | firewall security | TechTerms

2:22

What is a Firewall and How Does it Work?

In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet.
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