High Quality Content by WIKIPEDIA articles! CONS, Connection-Oriented Network Service, is one of the two OSI network layer protocols, the other being CLNS (Connectionless Network Service). It is basically X.25, with a few adjustments. The Network Layer is Layer 3 of the seven-layer OSI model of computer networking. The Network Layer is responsible for routing packets delivery including routing through intermediate routers, whereas the Data Link Layer is responsible for Media Access Control, Flow Control and Error Checking. The Network Layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination host via one or more networks while maintaining the quality of service functions.

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