Core networking concepts including IP addressing, the OSI model, and how devices communicate across networks.
TL;DR — The Short Version The OSI model is a 7-layer reference framework that describes how data travels between applications across a network. It is not software you install or a protocol you configure. The seven layers, bottom to top: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Mnemonic: Please Do Not Throw Sausage … Read more
Master the common network ports every IT pro should know, organized by category for TCP and UDP. Includes port security, how to check open ports, and why HTTP/3 now puts HTTPS on UDP 443.
What Is a MAC Address? How to Find and Look Up Yours TL;DR — Key Takeaways A MAC address is a unique 48-bit hardware identifier assigned to every network interface card (NIC) — it’s how devices identify each other on a local network. MAC addresses operate at Layer 2 (data link) and look like A4:83:E7:2F:5B:10 … Read more