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This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model.This list is not exclusive to only the OSI protocol family.Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.
The link layer corresponds to the OSI data link layer and may include similar functions as the physical layer, as well as some protocols of the OSI's network layer. These comparisons are based on the original seven-layer protocol model as defined in ISO 7498, rather than refinements in the internal organization of the network layer.
SMTP—Simple Mail Transfer Protocol; SNA—Systems Network Architecture; SNMP—Simple Network Management Protocol; SNTP—Simple Network Time Protocol; SOA—Service-Oriented Architecture; SOAP—Simple Object Access Protocol; SOAP—Symbolic Optimal Assembly Program; SOPA—Stop Online Piracy Act; SoC—System-on-a-Chip; SO-DIMM—Small ...
Layer Protocol data unit (PDU) Function [3] Host layers 7 Application: Data: High-level protocols such as for resource sharing or remote file access, e.g. HTTP. 6 Presentation: Translation of data between a networking service and an application; including character encoding, data compression and encryption/decryption: 5 Session
Multiple layers NAC: Network access control Link and other layers IEEE 802.1x: NAS: Network-attached storage Hardware / Storage Computer data storage: NAT: Network Address Translation Internet Layer Cisco Internet Protocol Journal: A look Inside Network Address Translators: NBMA: Non-Broadcast Multiple Access (e.g. Frame Relay ATM) Telecom
Dynamic Source Routing Protocol RFC 4728: 0x31 49 BNA Burroughs Network Architecture 0x32 50 ESP Encapsulating Security Payload: RFC 4303: 0x33 51 AH Authentication Header: RFC 4302: 0x34 52 I-NLSP Integrated Net Layer Security Protocol: TUBA 0x35 53 SwIPe SwIPe: RFC 5237: 0x36 54 NARP NBMA Address Resolution Protocol: RFC 1735: 0x37 55 MOBILE
Functions of the network layer include: Connectionless communication For example, Internet Protocol is connectionless, in that a data packet can travel from a sender to a recipient without the recipient having to send an acknowledgement. Connection-oriented protocols exist at other, higher layers of the OSI model. Host addressing
Although the applications are usually aware of key qualities of the transport layer connection such as the endpoint IP addresses and port numbers, application layer protocols generally treat the transport layer (and lower) protocols as black boxes which provide a stable network connection across which to communicate. The transport layer and ...