As you know from taking my classes, computers prefer numbers and humans prefer letters or words. Port numbers are numerical placeholders for protocol names. The best way to learn them is through daily professional use, or memorization. Flash cards can be helpful if you are preparing for an exam that is heavy in ports and protocols, such as the CompTIA A+ or Network+.
Here is another study aid provided by Rich Muldoon. Click on the image to enlarge to full size ...
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