This is an incomplete list of individual network protocols, categorized by their nearest OSI model layers.

Layer 1 protocols (Physical layer)

• ISDN Integrated Services Digital Network
• PDH Plesiochronous Digital Hierarchy
  • T-carrier (T1, T3, etc.)
  • E-carrier (E1, E3, etc.)
• RS-232, a serial line interface originally developed to connect modems and computer terminals
• SDH Synchronous Digital Hierarchy
• SONET Synchronous Optical NETworking

Layer 2 protocols (Data link layer)

• ARP Address Resolution Protocol
• ARCnet
• CDP Cisco Discovery Protocol
• DCAP Data Link Switching Client Access Protocol
• Econet
• Ethernet
• FDDI Fiber Distributed Data Interface
• Frame Relay
• HDLC High Level Data Link Control
• 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
• PPP Point-to-Point Protocol
• PPTP Point-to-Point Tunneling Protocol
• SLIP Serial Line Internet Protocol (obsolete)
• StarLan
• STP Spanning Tree Protocol
• Token ring
• VTP VLAN Trunking Protocol

Layer 2+3 protocols

• ATM Asynchronous Transfer Mode
• Frame relay, a simplified version of X.25
• MPLS Multi-protocol label switching
• Signalling System 7, also called SS7, C7 and CCIS7; a common PSTN control protocol.
• X.25

Layer 3 protocols (Network layer)

• ARP Address Resolution Protocol
• BGP Border Gate way Protocol
• EGP Exterior Gateway Protocol
• ICMP Internet Control Message Protocol
• IGMP Internet Group Management Protocol
• IPv4 Internet Protocol version 4
• IPv6 Internet Protocol version 6
• IPX Internetwork Packet Exchange
• MPLS Multiprotocol Label Switching
• OSPF Open Shortest Path First
• RARP Reverse Address Resolution Protocol
• RIP Routing Information Protocol

Layer 3+4 protocols

• Xerox Network Services (XNS)

Layer 4 protocols (Transport layer)

• IL Originally developed as transport layer for 9P
• RTP Real-time Transport Protocol
• SPX Sequenced Packet Exchange
• SCTP Stream Control Transmission Protocol
• TCP Transmission Control Protocol
• UDP User Datagram Protocol

Layer 5 protocols (Session layer)

• 9P Distributed file system protocol developed originally as part of Plan 9
• NCP NetWare Core Protocol
• NFS Network File System
• SMB Server Message Block (aka CIFS Common Internet FileSystem)

Layer 7 protocols (Application layer)

• AFP Apple Filing Protocol
• BACnet Building Automation and Control Network protocol
• BitTorrent, a peer-to-peer file sharing protocol
• BOOTP Bootstrap Protocol
• DIAMETER, an authentication, authorization and accounting protocol
• DICT Dictionary protocol
• DNS Domain Name Service
• DHCP Dynamic Host Configuration Protocol
• FTP File Transfer Protocol
• Finger, which gives user profile information
• Gnutella, a peer-to-peer file-swapping protocol
• Gopher, a precursor of web search engines
• HTTP HyperText Transport Protocol, used in the World Wide Web
• IMAP Internet Message Access Protocol
• IRC Internet Relay Chat protocol
• Jabber, an instant-messaging protocol
• LDAP Lightweight Directory Access Protocol
• MIME Multipurpose Internet Mail Extensions
• NNTP News Network Transfer Protocol
• NTP Network Time Protocol
• POP3 Post Office Protocol Version 3
• RADIUS, an authentication, authorization and accounting protocol
• Rlogin, a UNIX remote login protocol
• rsync, a file transfer protocol for backups, copying and mirroring
• SSH Secure SHell
• SIP, a signaling protocol
• SMTP Simple Mail Transfer Protocol
• SNMP Simple Network Management Protocol
• Telnet, a remote terminal access protocol
• TFTP Trivial File Transfer Protocol, a simple file transfer protocol
• WebDAV Web Distributed Authoring and Versioning

and secure versions of the above (HTTPS, etc.)

Protocol description languages

• Abstract syntax notation one (ASN.1)

Other protocols

• Controller Area Network (CAN)
• Digital Command Control (DCC)
• DSA Distributed Systems Architecture (Honeywell Bull)
• FIX protocol
• Gateway Discovery Protocol GDP is a Cisco protocol similar to IRDP
• ICMP Router Discovery Protocol Implementation of RFC 1256
• I²C
• modbus
• SNA Systems Network Architecture (IBM)
• SOCKS
• STUN

External links

• Protocol Encapsulation Chart - A PDF file illustrating the relationship between common protocols and the OSI Reference Model.
• List of protocols – A very expansive list of protocols with examinations on many different types of protocols.

Network protocols | Technology-related lists

Protocollo di rete | Список мережевих протоколів