List of Protocols - on different layers of OSI model

Layer 1 protocols (Physical Layer)

* ADSL Asymmetric digital subscriber line
* ISDN Integrated Services Digital Network
* PDH Plesiochronous Digital Hierarchy
o T-carrier (T1, T3, etc.)
o 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
* Modem standards/ITU V-Series Protocols used to communicate between analog modems over voice telephone lines.
* Various Ethernet physical layers

Layer 2 protocols (Data Link Layer)

* ARCnet
* CDP Cisco Discovery Protocol
* DCAP Data Link Switching Client Access Protocol
* Dynamic Trunking Protocol
* Econet
* Ethernet
* FDDI Fiber Distributed Data Interface
* Frame Relay
* HDLC High Level Data Link Control
* IEEE 802.11
* IEEE 802.16
* 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
* PPP Point-to-Point Protocol
* PPTP Point-to-Point Tunneling Protocol
* Q.710 Simplified Message Transfer Part
* NDP Neighbor Discovery 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
* X.25
* ARP Address Resolution Protocol
* RARP Reverse Address Resolution Protocol

Layer 1+2+3 protocols

* MTP Message Transfer Part
* NSP Network Service Part

Layer 3 protocols (Network Layer)

* CLNP Connectionless Networking Protocol
* EGP Exterior Gateway Protocol
* EIGRP Enhanced Interior Gateway Routing Protocol
* ICMP Internet Control Message Protocol
* IGMP Internet Group Management Protocol
* IGRP Interior Gateway Routing Protocol
* IPv4 Internet Protocol version 4
* IPv6 Internet Protocol version 6
* IPSec Internet Protocol Security
* IPX Internetwork Packet Exchange
* MPLS Multiprotocol Label Switching
* SCCP Signalling Connection Control Part

Layer 3 protocols (Network Layer management)

* IS-IS Intermediate system to intermediate system
* OSPF Open Shortest Path First
* BGP Border Gateway Protocol
* RIP Routing Information Protocol

Layer 3.5 protocols

* HIP Host Identity Protocol

Layer 3+4 protocols

* Xerox Network Services

Layer 4 protocols (Transport Layer)

* AHAH Authentication Header over IP or IPSec
* ESPESP Encapsulated Security Payload over IP or IPSec
* GRE Generic Routing Encapsulation for tunneling
* 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

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

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 System
* DHCP, Dynamic Host Configuration Protocol
* ED2K, A peer-to-peer file sharing protocol
* FTP, File Transfer Protocol
* Finger, which gives user profile information
* Gnutella, a peer-to-peer file-swapping protocol
* Gopher, a hierarchical hyperlinkable protocol
* HTTP, HyperText Transfer Protocol
* IMAP, Internet Message Access Protocol
* IRC, Internet Relay Chat protocol
* ISUP, ISDN User Part
* Jabber, an instant-messaging protocol
* LDAP Lightweight Directory Access Protocol
* MIME, Multipurpose Internet Mail Extensions
* MSNP, Microsoft Notification Protocol (used by Windows Live Messenger)
* MAP, Mobile Application Part
* NetBIOS, File Sharing and Name Resolution protocol - the basis of file sharing with Windows.
* NNTP, News Network Transfer Protocol
* NTP, Network Time Protocol
* NTCIP, National Transportation Communications for Intelligent Transportation System 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
* 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
* 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
* WebDAV, Web Dist Authoring and Versioning