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Connectionless communication, often referred to as CL-mode communication, [1] is a data transmission method used in packet switching networks, using data packets that are frequently called datagrams, in which each data packet is individually addressed and routed based on information carried in each packet, rather than in the setup information ...
Several protocols provide the CLNS service: [3] Connectionless-mode Network Protocol (CLNP), as specified in ITU-T Recommendation X.233. [6]End System-to-Intermediate System (ES-IS), a routing exchange protocol for use in conjunction with the protocol for providing the CLNS (ISO 9542).
User Datagram Protocol is a simpler message-based connectionless protocol. Connectionless protocols do not set up a dedicated end-to-end connection. Communication is achieved by transmitting information in one direction from source to destination without verifying the readiness or state of the receiver.
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.
Reliable connectionless protocols exist as well, for example AX.25 network layer protocol when it passes data in I-frames, but this combination is rare, and reliable-connectionless is uncommon in modern networks. Some connection-oriented protocols have been designed or altered to accommodate both connection-oriented and connectionless data. [1]
The Internet Protocol (IP) ... In network architectural parlance, it is a connectionless protocol, in contrast to connection-oriented communication.
The Internet Protocol (IP) defines standards for several types of datagrams. The internet layer is a datagram service provided by an IP. For example, UDP is run by a datagram service on the internet layer. IP is an entirely connectionless, best effort, unreliable, message delivery service.
The connectionless protocol classes provide the capabilities needed to transfer one Network Service Data Unit (NSDU) in the "data" field of an XUDT, LUDT or UDT message. When one connectionless message is not sufficient to convey the user data contained in one NSDU, a segmenting/reassembly function for protocol classes 0 and 1 is provided.