4 Layer Internet Model
- Application Layer
- Transport Layer
- Network Layer
- IP and Routing
- No need to concern how packets are sent via link layer
- Delivers datagrams end-to-end. Best-effort delivery, no guarantees. Must be used with the Internet Protocol.
- Link Layer
- Ethernet or wifi
- Delivers data over a single link between an end host and router, or between routers
7 Layer OSI Model
![image.png](https://img.ynchen.me/2023/02/f7969e87e3d75926237be138fb447066.webp)
7 Layer OSI Model
- Physical Layer
- Data Link Layer
- Network Layer
- Transport Layer
- Session Layer
- Presentation Layer
- Application Layer
![image.png](https://img.ynchen.me/2023/02/b0cb7ea848e7e26ea5e44b6f44893468.webp)