# Network model

### Network models

![Common network models](https://2259236002-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fuh9xZDZ53qGqmMCM44PU%2Fuploads%2Fgit-blob-e3903ce144c93f4bc4ae97fc240a35745e394ab8%2Fnetwork_model_20230330004442.png?alt=media)

* Peer-to-peer: used for sharing resources (files, printers, storage)
* Client-server: data management & hosting are centralized at the server.

### Network types

* **LAN** (Ethernet standard): used in limited geographical area (floor, building, campus...)
* **WAN**: connects devices in a large geographical area, such as multiple cities or countries. WAN are used to connect LANs, and use technologies such as fiber-optic cables. The Internet is the largest WAN.

### IPv4 vs IPv6

![](https://2259236002-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fuh9xZDZ53qGqmMCM44PU%2Fuploads%2Fgit-blob-18bcf2b49ebca12072ee450a57d5ce1744fd4eac%2Fnetwork_model_20230330005346.png?alt=media)