List of network protocols (OSI model)

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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)[edit]

Layer 2 (data link layer)[edit]

Network Topology[edit]

Layer 2.5[edit]

  • ARP Address Resolution Protocol
  • MPLS Multiprotocol Label Switching
  • PPPoE Point-to-Point Protocol over Ethernet
  • TIPC Transparent Inter-process Communication

Layer 3 (Network Layer)[edit]

Layer 3+4 (Protocol Suites)[edit]

Layer 4 (Transport Layer)[edit]

  • AEP AppleTalk Echo Protocol
  • AH Authentication Header over IP or IPSec
  • DCCP Datagram Congestion Control Protocol
  • ESP Encapsulating Security Payload over IP or IPSec
  • FCP Fibre Channel Protocol
  • NetBIOS NetBIOS, File Sharing and Name Resolution
  • IL Originally developed as transport layer for 9P
  • iSCSI Internet Small Computer System Interface
  • NBF NetBIOS Frames protocol
  • SCTP Stream Control Transmission Protocol
  • Sinec H1 for telecontrol
  • TUP, Telephone User Part
  • SPX Sequenced Packet Exchange
  • NBP Name Binding Protocol {for AppleTalk}
  • TCP Transmission Control Protocol
  • UDP User Datagram Protocol
  • QUIC

Layer 5 (Session Layer)[edit]

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

  • 9P Distributed file system protocol developed originally as part of Plan 9
  • ADSP AppleTalk Data Stream Protocol
  • ASP AppleTalk Session Protocol
  • H.245 Call Control Protocol for Multimedia Communications
  • iSNS Internet Storage Name Service
  • NetBIOS, File Sharing and Name Resolution protocol - the basis of file sharing with Windows.
  • NetBEUI, NetBIOS Enhanced User Interface
  • NCP NetWare Core Protocol
  • PAP Printer Access Protocol
  • RPC Remote Procedure Call
  • RTCP RTP Control Protocol
  • SDP Sockets Direct Protocol
  • SMB Server Message Block
  • SMPP Short Message Peer-to-Peer
  • ZIP Zone Information Protocol {For AppleTalk}
  • This layer provides session management capabilities between hosts. For example, if some host needs a password verification for access and if credentials are provided then for that session password verification does not happen again. This layer can assist in synchronization, dialog control and critical operation management (e.g., an online bank transaction).

Layer 6 (Presentation Layer)[edit]

  • TLS Transport Layer Security[2]
  • SSL Secure Socket Tunneling[2]
  • AFP Apple Filing Protocol[2]
  • Independent Computing Architecture (ICA), the Citrix system core protocol
  • Lightweight Presentation Protocol (LPP)[2]
  • NetWare Core Protocol (NCP)
  • Network Data Representation (NDR)[2]
  • Tox, The Tox protocol is sometimes regarded as part of both the presentation and application layer
  • eXternal Data Representation (XDR)[2]
  • X.25 Packet Assembler/Disassembler Protocol (PAD)

Layer 7 (Application Layer)[edit]

Other protocols[edit]

Protocol description languages[edit]

See also[edit]


  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[edit]

External links[edit]