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A firewall is an online security measure to protect your computer from viruses and other malicious attacks.
You can use the internet to communicate with around 4.9 billion people worldwide.
A firewall works at your computer's ports. When we're talking about computer networking, a port isn't the same as a jack or socket you plug your monitor into. Rather it's a virtual entry point where your computer exchanges information with other networks.
Every computer has lots of ports, ...
When a firewall checks if data can enter your network, it'll read a message that comes with it called metadata. This will list a string of numbers indicating where the data has come from (known as the source address), where it's going (the 'destination address' aka your PC) and over which port.
A video file isn't sent from YouTube to your computer as a single file. Instead, it's broken down into smaller pieces called data packets, which reassemble once you receive them, according to the website security company Cloudflare. Packet-filtering firewalls will check each data packet to make s...
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