Whether it be OSI or TCP/IP model, they are frameworks which describe how the data is transmitted between layers in a network. OSI model has 7 layers where as TCP/IP has 4 layers. Remember that OSI is a conceptual model only where as TCP/IP is practical. Our entire internet runs on TCP/IP.
OSI stands for Open system interconnection
TCP/IP stands for Transport Protocol/Internet Protocol
| Model | Layers | Description |
|---|---|---|
| OSI Model | 7 Layers | Physical, Data Link, Network, Transport, Session, Presentation, Application |
| TCP/IP Model | 4 Layers | Network Interface, Internet, Transport, Application |
Below is a TCP/IP model
Let us look at mapping of various layers between TCP/IP and OSI models.
| OSI Model | TCP/IP Model | Protocols/Interfaces |
|---|---|---|
| Application | Application | HTTP, FTP, SMTP |
| Presentation | Application | (handled within applications) |
| Session | Application | (handled within applications) |
| Transport | Transport | TCP, UDP |
| Network | Internet | IP, ICMP |
| Data Link | Network Interface | Ethernet, Wi-Fi |
| Physical | Network Interface | Cables, signals |
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