The Open Systems Interconnection model (OSI model) is a reference model from the International Organization for Standardization (ISO) that "provides a common basis for the coordination of standards development for the purpose of systems interconnection."[2] In the OSI reference model, the communications between systems are split into seven different abstraction layers: Physical, Data Link, Network
![OSI model -network layer](https://cdn-ak-scissors.b.st-hatena.com/image/square/b16e63f2e4bfcef3b946628ece8cc3c9409cf47c/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2F4%2F41%2FOSI-model-Communication.svg%2F1200px-OSI-model-Communication.svg.png)