Glossary term
What is OSI model (Open Systems Interconnection)?
OSI model stands for Open Systems Interconnection.
In System Design
A 7-layer model describing how network communication works. Example: "L4" and "L7" load balancers come from this model.
Learn it properly · System DesignLesson 1: What Happens When You Type a URL and Press Enter?The one second between pressing Enter and seeing a page hides a DNS lookup, a trip through a dozen routers, two handshakes and a server doing real work. Every later lesson zooms into one part of that journey.In Networking for Developers
A seven-layer teaching model of networking whose layer numbers engineers still use when they talk.
Learn it properly · Networking for DevelopersLesson 0: How the Internet Works: Layers, Packets and AddressesThe layer models, what a packet is, MAC, IP and ports, and following one request from your laptop to a server.