After a Hacker has selects her target, the thing she scan next on the target's network to see if any are open System Ports.
In port scan, hackers often send a message to all the port, once at a time. The response they tend to receive from each port will help them to known if it's being used and reveals the various weaknesses.
Security techs often conduct port scanning for a lot of network inventory and to show any possible security vulnerabilities.
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