Open Systems Interconnection - 7-Layer Network Model
The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes network communication into seven distinct layers. Each layer has specific functions and communicates with adjacent layers to enable reliable data transmission.
Each layer has specific responsibilities and communicates with adjacent layers.
Provides a common framework for understanding network communication.
Allows independent development and modification of each layer.
User interface and network services
Data translation, encryption, compression
Session management and dialog control
End-to-end communication and reliability
Routing and logical addressing
Physical addressing and error detection
Physical transmission of data bits
| OSI Model | TCP/IP Model | Protocols |
|---|---|---|
| Application (7) | Application | HTTP, FTP, SMTP, DNS |
| Presentation (6) | Application | SSL/TLS, JPEG, MPEG |
| Session (5) | Application | NetBIOS, RPC |
| Transport (4) | Transport | TCP, UDP |
| Network (3) | Internet | IP, ICMP, ARP |
| Data Link (2) | Network Access | Ethernet, WiFi |
| Physical (1) | Network Access | Cables, Wireless |