Connectionless-mode Network Service
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. 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 (IP) and the User Datagram Protocol (UDP).
Read more about Connectionless-mode Network Service: Connectionless-mode Network Protocol (CLNP), Transport Protocol Class 4 (TP4) in Conjunction With CLNS, Protocols Providing CLNS
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