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This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model. This list is not exclusive to only the OSI protocol family. Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.

Layer 1 (physical layer)

Layer 2 (data link layer)

Network Topology

Layer 2.5

Layer 3 (Network Layer)

Layer 3+4 (Protocol Suites)

Layer 4 (Transport Layer)

Layer 5 (Session Layer)

This layer, presentation Layer and application layer are combined in TCP/IP model.

Layer 6 (Presentation Layer)

Layer 7 (Application Layer)

Other protocols

Protocol description languages

See also


  1. ^ "X.225 : Information technology – Open Systems Interconnection – Connection-oriented Session protocol: Protocol specification". Archived from the original on 1 February 2021. Retrieved 10 March 2023.
  2. ^ a b c d e f "Presentation Layer in OSI model". GeeksforGeeks. 2021-07-05. Retrieved 2022-08-15.

Further reading