Open Systems Interconnection (OSI) / International Standard Organisation (ISO)
| Open Systems Interconnection (OSI) model | ||||
| Data Unit | Layer | Function | Example | |
Host Layers
|
Data
| Application Layer | Network to Application | HTTP,FTP,SMTP |
| Presentation Layer | Encryption/Decryption | JPEG,GIF,MPEG | ||
| Session Layer | Manage Sessions | Apple Talk,Winsock | ||
| Segments | Transport Layer | Delivery Of Packets | TCP,UDP | |
Media Layers
| Packet/Datagram | Network Layer | Routing | IP,ICMP,IPX |
| Bit/Frame | Data Link Layer | Point-to-Point (Switch,Bridge) | Ethernet,ATM | |
| Bit | Physical Layer | Point-to-Point (Hub,Repeater) | Ethernet,Token Ring | |
