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| OSI model by layer |
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 | This article may be too technical for most readers to understand. (September 2010) |
Connectionless-mode Network Service (CLNS) or simply Connectionless Network Service is an OSI network layer datagram service that does not require a circuit to be established before data is transmitted, and routes messages to their destinations independently of any other messages.[2][3] As such it is a "best-effort" rather than a "reliable" delivery service. CLNS is not an Internet service, but provides capabilities in an OSI network environment similar to those provided by the Internet protocol suite. The service is specified in ISO/IEC 8348,[4] the OSI Network Service Definition (which also defines the connection-oriented service, CONS.)
- ^ "X.225 : Information technology – Open Systems Interconnection – Connection-oriented Session protocol: Protocol specification". Archived from the original on 1 February 2021. Retrieved 10 March 2023.
- ^ "Section 3: Definition of the Connectionless-Mode Service", ITU-T Recommendation X.213: Open Systems Interconnection – Network service definition, International Telecommunication Union, October 2001
- ^ "ISO Connectionless Network Service" Archived 2008-06-21 at the Wayback Machine, Chapter 2, Section 1 in IS-IS Network Design Solutions, Cisco Press, 7 February 2002, ISBN 1-57870-220-8
- ^ "ISO/IEC 8348: OSI Network Service Definition".