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NETWORK LAYERS

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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