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computer networking 

Computer networking refers to interconnected computing devices that can exchange data and share resources with each other. These networked devices use a system of rules, called communications protocols, to transmit information over physical or wireless technologies..

Ethical hacking

Ethical hacking aims to mimic an actual attack to look for attack vectors against the target. The initial goal is to perform reconnaissance, gaining as much information as possible. Once an ethical hacker gathers enough information, they use it to look for vulnerabilities..