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This is an incomplete list of individual network protocols, categorized by their nearest OSI model layers.
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Physical layer|Layer 1 protocols (Physical layer)
ISDN Integrated Services Digital Network
PDH Plesiochronous Digital Hierarchy
RS-232, a serial line interface originally developed to connect modems and computer terminals
SDH Synchronous Digital Hierarchy
SONET Synchronous Optical NETworking
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Data link layer|Layer 2 protocols (Data link layer)
ARP Address Resolution Protocol
CDP Cisco Discovery Protocol
DCAP Data Link Switching Client Access Protocol
FDDI Fiber Distributed Data Interface
HDLC High Level Data Link Control
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)
STP Spanning Tree Protocol
VTP VLAN Trunking Protocol
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Layer 2+3 protocols
ATM Asynchronous Transfer Mode
MPLS Multi-protocol label switching
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Network layer|Layer 3 protocols (Network layer)
ARP Address Resolution Protocol
BGP Border Gateway 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
IS-IS Intermediate system to intermediate system
MPLS Multiprotocol Label Switching
OSPF Open Shortest Path First
RARP Reverse Address Resolution Protocol
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Layer 3+4 protocols
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Transport layer|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
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Session layer|Layer 5 protocols (Session layer)
9P Distributed file system protocol developed originally as part of Plan 9
NCP NetWare Core Protocol
SMB Server Message Block (aka CIFS Common Internet FileSystem)
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Application layer|Layer 7 protocols (Application layer)
AFP Apple Filing Protocol
BACnet Building Automation and Control Network protocol
DIAMETER, an authentication, authorization and accounting protocol
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
SIP, Session Initiation Protocol, a signalling 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
RIP Routing Information Protocol
and secure versions of the above (HTTPS, etc.)
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Protocol description languages
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Other protocols
DSA Distributed Systems Architecture (Honeywell Bull)
SNA Systems Network Architecture (IBM)
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