Computer Networks
Comparison between OSI Model and TCP/IP reference model.
| Feature | OSI Model | TCP/IP Model |
|---|---|---|
| Developer | ISO (International Standard Organization) | ARPANET (Advanced Research Project Agency Network) |
| Distinction | Clear distinction between interfaces, services, and protocols | No clear distinction between services, interfaces, and protocols |
| Name | Open Systems Interconnection | Transmission Control Protocol / Internet Protocol |
| Quality of Services | Provides quality services | Does not provide quality services |
| Approach | Vertical approach | Horizontal approach |
| Layers | Seven layers | Four layers |
| Network Layer Service | Provides both connection-oriented and connection-less service | Provides only connection-less service |
| Physical and Data Link Layers | Separate layers | Combined as a single network access layer |
| Session and Presentation Layers | Part of the model | Not present in the model |
| Defined After/Before Internet | Defined after the advent of the Internet | Defined before the advent of the Internet |
| Minimum Header Size | 5 bytes | 20 bytes |
| Transport Layer Guarantee | Provides a guarantee for packet delivery | Does not provide a guarantee for packet delivery |
| Development Sequence | Developed first; protocols created to fit the network architecture’s needs | Protocols created first; model built to fit the protocols |