![]() For example when you have written a web application that runs on port 8000. We also have ports that are used by the user itself. We have system reserved ports for well-known services such as NGINX or Apache (which is 80/443). The packets in the internet (or any other network for that matter) are transferred using ports. ![]() To cover the fundamentals, firewalling is the idea of deciding which packets are allowed to go in/out of the system. Photo by Pixabay from Pexels What was firewall again?
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