List of network protocols (OSI model)

This article is about network protocols organized by OSI model. For network protocols organized by TCP/IP model, see Internet Protocol Suite.

This is a list of network protocols, categorized by their nearest Open Systems Interconnection (OSI) model layers. 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.

OSI model by layer
7. Application layer NNTP SIP SSI DNS FTP Gopher HTTP NFS NTP SMPP SMTP SNMP Telnet DHCP Netconf more....
6. Presentation layer MIME XDR
5. Session layer Named pipe NetBIOS SAP PPTP RTP SOCKS SPDY
4. Transport layer TCP UDP SCTP DCCP SPX
3. Network layer IP IPv4 IPv6 ICMP IPsec IGMP IPX AppleTalk X.25 PLP
2. Data link layer ATM ARP IS-IS SDLC HDLC CSLIP SLIP GFP PLIP IEEE 802.2 LLC MAC L2TP IEEE 802.3 Frame Relay ITU-T G.hn DLL PPP X.25 LAPB Q.921 LAPD Q.922 LAPF
1. Physical layer EIA/TIA-232 EIA/TIA-449 ITU-T V-Series I.430 I.431 PDH SONET/SDH PON OTN DSL IEEE 802.3 IEEE 802.11 IEEE 802.15 IEEE 802.16 IEEE 1394 ITU-T G.hn PHY USB Bluetooth RS-232 RS-449

Layer 1 (Physical Layer)

Telephone network modems
IRDA physical layer
USB physical layer
EIA RS-232, EIA-422, EIA-423, RS-449, RS-485
Ethernet physical layer 10BASE-T, 10BASE2, 10BASE5, 100BASE-TX, 100BASE-FX, 100BASE-T, 1000BASE-T, 1000BASE-SX and other varieties
Varieties of 802.11 Wi-Fi physical layers
DSL
ISDN
T1 and other T-carrier links, and E1 and other E-carrier links
SONET/SDH
Optical Transport Network (OTN)
GSM Um air interface physical layer
Bluetooth physical layer
ITU Recommendations: see ITU-T
IEEE 1394 interface
TransferJet
Etherloop
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
infrared
wi-fi

Layer 2 (Data Link Layer)

ARP Address Resolution Protocol
ARCnet　Attached Resource Computer NETwork
CDP Cisco Discovery Protocol
DCAP Data Link Switching Client Access Protocol
Distributed Multi-Link Trunking
Distributed Split Multi-Link Trunking
Dynamic Trunking Protocol
Econet
Ethernet
FDDI Fiber Distributed Data Interface
Frame Relay
ITU-T G.hn Data Link Layer
HDLC High-Level Data Link Control
IEEE 802.11 WiFi
IEEE 802.16 WiMAX
LACP Link Aggregation Control Protocol
LattisNet
LocalTalk
L2F Layer 2 Forwarding Protocol
L2TP Layer 2 Tunneling Protocol
LAPD Link Access Procedures on the D channel
LLDP Link Layer Discovery Protocol
LLDP-MED Link Layer Discovery Protocol - Media Endpoint Discovery
PAgP - Cisco Systems proprietary link aggregation protocol
PPP Point-to-Point Protocol
Q.710 Simplified Message Transfer Part
Multi-link trunking Protocol
RPR IEEE 802.17 Resilient Packet Ring
SLIP Serial Line Internet Protocol (obsolete)
StarLAN
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.
VTP VLAN Trunking Protocol
VLAN Virtual Local Area Network
MAC Media Access Control

Layer 2.5

MPLS Multiprotocol Label Switching

Layer 3+4 (protocol suites)

Layer 4 (Transport Layer)

AH Authentication Header over IP or IPSec
ESP Encapsulating Security Payload over IP or IPSec
IL Originally developed as transport layer for 9P
SCTP Stream Control Transmission Protocol
Sinec H1 for telecontrol
SPX Sequenced Packet Exchange
TCP Transmission Control Protocol
UDP User Datagram Protocol
DCCP Datagram Congestion Control Protocol

Layer 5 (Session Layer)

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

BGP Border Gateway Protocol
9P Distributed file system protocol developed originally as part of Plan 9
NetBIOS, File Sharing and Name Resolution protocol - the basis of file sharing with Windows.
NetBEUI, NetBIOS Enhanced User Interface
PPTP Point-to-Point Tunneling Protocol
NCP NetWare Core Protocol
NFS Network File System
SMB Server Message Block
SOCKS "SOCKetS"
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
AFP Apple Filing Protocol

Layer 7 (Application Layer)

ADC, A peer-to-peer file sharing protocol
AFP, Apple Filing Protocol
AMQP, Advanced Message Queuing Protocol
BACnet, Building Automation and Control Network protocol
BitTorrent, A peer-to-peer file sharing protocol
BOOTP, Bootstrap Protocol
CAMEL, an SS7 protocol tool for the home operator
Diameter, an authentication, authorization and accounting protocol
DICOM includes a network protocol definition
DICT, Dictionary protocol
DNS, Domain Name System
DSM-CC Digital Storage Media Command and Control
DSNP, Distributed Social Networking Protocol
DHCP, Dynamic Host Configuration Protocol
ED2K, A peer-to-peer file sharing protocol
Finger, which gives user profile information
FTP, File Transfer Protocol
Gnutella, a peer-to-peer file-swapping protocol
Gopher, a hierarchical hyperlinkable protocol
HTTP, Hypertext Transfer Protocol
HTTPS, Hypertext Transfer Protocol Secure
IMAP, Internet Message Access Protocol
IRC, Internet Relay Chat
ISUP, ISDN User Part
LDAP Lightweight Directory Access Protocol
MIME, Multipurpose Internet Mail Extensions
MSNP, Microsoft Notification Protocol (used by Windows Live Messenger)
MAP, Mobile Application Part
Mosh, Mobile Shell
MQTT, Publish-Subscribe Messaging protocol
NNTP, Network News Transfer Protocol
NTP, Network Time Protocol
NTCIP, National Transportation Communications for Intelligent Transportation System Protocol
OpenADR Open Automated Demand Response; protocol to manage electricity consuming/controlling devices
POP3 Post Office Protocol Version 3
RADIUS, an authentication, authorization and accounting protocol
RDP, Remote Desktop Protocol
Rlogin, a UNIX remote login protocol
rsync, a file transfer protocol for backups, copying and mirroring
RTP, Real-time Transport Protocol
RTSP, Real-time Transport Streaming Protocol
SSH, Secure Shell
SISNAPI, Siebel Internet Session Network API
SIP, Session Initiation Protocol, a signaling protocol
SMTP, Simple Mail Transfer Protocol
SNMP, Simple Network Management Protocol
SOAP, Simple Object Access Protocol
SMB, Microsoft Server Message Block Protocol
Simple Service Discovery Protocol, A discovery protocol employed by UPnP
STUN, Session Traversal Utilities for NAT
TUP, Telephone User Part
Telnet, a remote terminal access protocol
TCAP, Transaction Capabilities Application Part
TFTP, Trivial File Transfer Protocol, a simple file transfer protocol
Universal Plug and Play
WebDAV, Web Distributed Authoring and Versioning
Extensible Messaging and Presence Protocol (XMPP)

Other protocols

Controller Area Network

Protocol description languages

Abstract Syntax Notation One (ASN.1)

External links

Protocol Encapsulation Chart - A PDF file illustrating the relationship between common protocols and the OSI Reference Model.
Network Protocols Acronyms and Abbreviations - list of network protocols with abbreviations order by index.

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