Editing OSI protocols (section)

==Layer 3: network layer==
* [[Connectionless Network Service]] (CLNS) – [http://www.itu.int/rec/T-REC-X.213/en/ ITU-T Rec. X.213 <nowiki>[</nowiki>ISO/IEC 8348<nowiki>]</nowiki>].  [[Signalling Connection Control Part|SCCP]] is based on X.213.
* [[Connectionless Network Protocol]] (CLNP) – [http://www.itu.int/rec/T-REC-X.233/en/ ITU-T Rec. X.233 <nowiki>[</nowiki>ISO/IEC 8473-1<nowiki>]</nowiki>].
* [[Connection-Oriented Network Service]] (CONS) – [http://www.itu.int/rec/T-REC-X.213/en/ ITU-T Rec. X.213 <nowiki>[</nowiki>ISO/IEC 8348<nowiki>]</nowiki>].
* Connection-Oriented Network Protocol ([[X.25]]) – [http://www.itu.int/rec/T-REC-X.233/en/ ITU-T Rec. X.233 <nowiki>[</nowiki>ISO/IEC 8878<nowiki>]</nowiki>].  This is the use of the [[X.25]] protocol to provide the CONS.
* Network Fast Byte Protocol – ISO/IEC 14700
* [[End System to Intermediate System Routing Exchange Protocol]] (ES-IS) - ISO/IEC 9452 (reprinted in RFC 995).
* [[Intermediate System to Intermediate System Intra-domain Routing Protocol]] (IS-IS) - ISO/IEC 10589 (reprinted in RFC 1142), later adapted for the [[TCP/IP]] model.
* End System Routing Information Exchange Protocol for use with ISO/IEC 8878 (SNARE) – [http://www.itu.int/rec/T-REC-X.116/en/ ITU-T Rec. X.116 <nowiki>[</nowiki>ISO/IEC 10030<nowiki>]</nowiki>].

This level is in charge of transferring data between systems in a network, using network-layer addresses of machines to keep track of destinations and sources. This layer uses routers and switches to manage its traffic (control flow control, error check, routing etc.)
So here it takes all routing decisions, it deals with end to end data transmission.