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List of network protocols (OSI model)

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)

Telephone network modems

EIA RS-232, EIA-422, EIA-423, RS-449, RS-485

Ethernet physical layer 10BASE-T, 10BASE2, 10BASE5, 100BASE-TX, 100BASE-FX, 1000BASE-T, 1000BASE-SX and other varieties

Varieties of 802.11 Wi-Fi physical layers

T1 and other T-carrier links, and E1 and other E-carrier links

ITU Recommendations: see ITU-T

ARINC 818 Avionics Digital Video Bus

G.hn/G.9960 physical layer

CAN bus (controller area network) physical layer

Mobile Industry Processor Interface physical layer

Layer 2 (data link layer)

ARCnet Attached Resource Computer NETwork

ARP Address Resolution Protocol

ATM Asynchronous Transfer Mode

CHAP Challenge Handshake Authentication Protocol

CDP Cisco Discovery Protocol

DCAP Data Link Switching Client Access Protocol

Distributed Multi-Link Trunking

Distributed Split Multi-Link Trunking

DTP Dynamic Trunking Protocol

FDDI Fiber Distributed Data Interface

HDLC High-Level Data Link Control

LACP Link Aggregation Control Protocol

L2F Layer 2 Forwarding Protocol

L2TP Layer 2 Tunneling Protocol

LLDP Link Layer Discovery Protocol

LLDP-MED Link Layer Discovery Protocol - Media Endpoint Discovery

MAC Media Access Control

Q.710 Simplified Message Transfer Part

Multi-link trunking Protocol

NDP Neighbor Discovery Protocol

PAgP - Cisco Systems proprietary link aggregation protocol

PPP Point-to-Point Protocol

PPTP Point-to-Point Tunneling Protocol

PAP Password Authentication Protocol

RPR IEEE 802.17 Resilient Packet Ring

SLIP Serial Line Internet Protocol (obsolete)

Space Data Link Protocol, one of the norms for Space Data Link from the Consultative Committee for Space Data Systems

STP Spanning Tree Protocol

Split multi-link trunking Protocol

Token Ring a protocol developed by IBM; the name can also be used to describe the token passing ring logical topology that it popularized.

Virtual Extended Network (VEN) a protocol developed by iQuila.

VTP VLAN Trunking Protocol

VLAN Virtual Local Area Network

Asynchronous Transfer Mode (ATM)

IS-IS, Intermediate System - Intermediate System (OSI)

SPB Shortest Path Bridging

MTP Message Transfer Part

NSP Network Service Part

TRILL (TRansparent Interconnection of Lots of Links)

ARP Address Resolution Protocol

MPLS Multiprotocol Label Switching

PPPoE Point-to-Point Protocol over Ethernet

TIPC Transparent Inter-process Communication

Layer 3 (Network Layer)

CLNP Connectionless Networking Protocol

IPX Internetwork Packet Exchange

NAT Network Address Translation

SCCP Signalling Connection Control Part

HSRP Hot Standby Router protocol

VRRP Virtual Router Redundancy Protocol

ICMP Internet Control Message Protocol

ARP Address Resolution Protocol

RIP Routing Information Protocol (v1 and v2)

OSPF Open Shortest Path First (v1 and v2)

Layer 3+4 (Protocol Suites)

Internet Protocol Suite

Layer 4 (Transport Layer)

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

Layer 5 (Session Layer)

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)

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)

SOAP, Simple Object Access Protocol

Simple Service Discovery Protocol, A discovery protocol employed by UPnP

TCAP, Transaction Capabilities Application Part

Universal Plug and Play

DHCP Dynamic Host Configuration Protocol

BOOTP Bootstrap Protocol

HTTP Hyper Text Transfer Protocol

POP3 Post Office Protocol

Telnet Tele Communication Protocol