10 free networking sites that actually teach you something. Bookmarked mine in 2015. Still using half of them today. Drop a comment with which one breaks your brain first. --- he.net/3d-map internet-map.net howdns.works osi-model-web.vercel.app cidr.xyz davidc.net subnettingpractice.com messwithdns.net bgp.he.net subnetcalculator.dev --- Save this before your next cert exam.
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