IP-Addressing
https://www.youtube.com/watch?v=tXzKjtMHgWI
https://www.youtube.com/watch?v=LIzTo6e4FgY
https://www.youtube.com/watch?v=s_Ntt6eTn94&ab_channel=PowerCertAnimatedVideos
https://www.youtube.com/watch?v=qij5qpHcbBk&list=RDCMUCZg4PvX48mgXQVySgIulX-Q&index=7&ab_channel=CertBros
https://www.youtube.com/watch?v=LANW3m7UgWs&ab_channel=CertBros