ISO/OSI REFERENCE MODEL LAYERS
The International Standards Organisation (ISO) defined seven levels of communication activity in its Open Systems Interconnection (OSI) model.
|
| Layer
| Name
| Protocols, coding, conversions
| Information
handled
|
| 7 |
Application |
Telenet, FTP, SMTP |
Message |
| 6 |
Presentation |
ASCII, EHCDIC, JPEG, GIF, encryption |
Message |
| 5 |
Session |
RPC, ZIP, SCP, SQL, NFS |
Message |
| 4 |
Transport |
TCP, NBP, UDP |
Segment,
datagram |
| 3 |
Network |
IP, ICMP, BGP, OSPF, RIP |
Packet |
| 2 |
Data Link |
MAC, LLC, Frame Relay, LAPB, PPP |
Frame |
| 1 |
Physical |
Ethernet, Token Ring, HSSI, 802.3 |
Bit |
For further information see RFC 1700 Assigned Numbers.
|
|
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