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
TL;DR — The Short Version Subnetting divides a large network into smaller, more manageable segments for better security, performance, and organization. A subnet mask tells you which bits of an IP address identify the network and which identify individual hosts. CIDR notation (like /24) is shorthand for how many bits belong to the network portion … Read more
Understand every DNS record type you’ll actually use, from A and MX to TXT and NS, with real examples. Plus the new HTTPS and SVCB records that speed up HTTP/3 and enable Encrypted Client Hello.
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
TL;DR — Key Takeaways Your public IP address is the address the rest of the internet sees when your devices connect. It is assigned by your ISP, not by you. The fastest way to find it is to use a web-based IP lookup tool. One click. You can also check your IP from the command … Read more