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 protocols|OSI protocol family]. Many of these protocols are originally based on the Internet Protocol Suite and other models and they often do not fit neatly into OSI layers.

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, 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
ITU Recommendations: see ITU-T
IEEE 1394 interfaces
TransferJet
Etherloop
ARINC 818 Avionics Digital Video Bus
G.hn/G.9960 physical layer
CAN bus physical layer
Mobile Industry Processor Interface physical layer
Frame Relay
FO Fiber optics
X.25

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
Econet
Ethernet
FDDI Fiber Distributed Data Interface
Frame Relay
ITU-T G.hn
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
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
StarLAN
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

Network Topology

Asynchronous Transfer Mode
IS-IS, Intermediate System - Intermediate System
SPB Shortest Path Bridging
MTP Message Transfer Part
NSP Network Service Part
TRILL

Layer 2.5

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

Layer 3+4 (Protocol Suites)

Layer 4 (Transport Layer">Transport layer">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
IL Originally developed as transport layer for 9P
iSCSI Internet Small Computer System Interface
NetBIOS NetBIOS, File Sharing and Name Resolution
NBF NetBIOS Frames protocol
NBP Name Binding Protocol
QUIC
SCTP Stream Control Transmission Protocol
Sinec H1 for telecontrol
TUP, Telephone User Part
SPX Sequenced Packet Exchange
TCP Transmission Control Protocol
UDP User Datagram Protocol
VXLAN Virtual eXtensible LAN
RDP Reliable Data Protocol

Layer 5 (Session Layer">Session layer">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
Printer Access Protocol
RPC Remote Procedure Call
RTCP RTP Control Protocol
SDP Session Direct Protocol
SMB Server Message Block
SMPP Short Message Peer-to-Peer
SOCKS "SOCKetS"
ZIP Zone Information Protocol
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.

Layer 6 (Presentation Layer">Presentation layer">Presentation Layer)

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

Layer 7 (Application Layer">Application layer">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
DNS Domain Name System
BOOTP Bootstrap Protocol
HTTP Hyper Text Transfer Protocol
HTTPS
WebSocket
NFS
POP3 Post Office Protocol
RTSP Real Time Streaming Protocol
SMTP
SNMP
FTP
NTP
IRC
Telnet Tele Communication Protocol
SSH
IMAP
Gemini

Other protocols

Controller Area Network

Protocol description languages

Abstract Syntax Notation One