HTG Explains: What is Port Scanning?

A port scan is a bit like jiggling a bunch of doorknobs to see which doors are locked. The scanner learns which ports on a router or firewall are open, and can use this information to find a computer system’s potential weaknesses.

from How-To Geek https://www.howtogeek.com/369506/htg-explains-what-is-port-scanning/
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