Firewalls protect computers and private networks from threats originating across the wider Internet. They come in both hardware and software flavors. They ensure unwanted network traffic is turned away or dropped and that legitimate traffic is only routed to the appropriate application. They work by both simply blocking ports and by analyzing packet data. Windows has had a built-in firewall since Windows XP. In this episode we provide a basic overview of firewalls.

Show Notes

• Episode 5: How does the Internet work?
• Episode 6: How does the Web work?
• Episode 18: How does Email Work?

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