Layer 1 protocols (Physical Layer)

• ADSL Asymmetric digital subscriber line
• 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
• 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 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
• 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 4 protocols (Transport Layer)

• AHAH , Authentication Header over IP or IPSec
• ESPESP ,Encapsulating 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 Block

 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
• DICOM includes a network protocol definition
• 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 hyper linkable protocol
• HTTP, Hyper Text 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, Fie 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 and secure versions of the above