Ports Introduction

The Ports Introduction page will outline what ports do, the common ports that you may encounter, and the relevant areas in which they are applied.

What is a Port?

Imagine you’re waiting inside of a large shop.

Inside of this shop is a large crowd of people all hassling one worker as to what part of the shop they need to navigate to to purchase a particular item.
It’s very easy to see how overwhelmed this worker would suddenly become trying to direct each customer without them leaving, getting lost, or even going un-monitored and causing a mess.

Now, Imagine instead that every customer entering the shop is required to wear a large name tag dictating what they are looking for. A set of workers are placed at the entrance and simply filter the customers to their respective isles in an orderly fashion, while maintaining a watchful eye on any problem customers.

I’m sure you’ll all agree that this is much easier and organised.

This is essentially what ports do; They provide an easier means to restrict and filter traffic to relevant applications.

Common Ports

Port 21: FTP (File Transfer Protocol)

Port 22: SSH (Secure SHell)

Port 25: SMTP (Simple Mail Traffic Protocol)

Port 53: DNS (Domain Name System)

Port 80: HTTP (Hyper Text Transfer Protocol)

Port 110: POP3 (Post Office Protocol 3)

Port 143: IMAP (Internet Message Access Protocol)

Port 443: SSL/HTTPS (Secure Socket Layer)

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