BS 7221:1989 - Open systems interconnection: specification for internal organization of the Network Layer
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This British Standard specifies the internal structure and functions of the Network Layer within the Open Systems Interconnection (OSI) reference model, as defined by ISO.
The Network Layer (Layer 3) is responsible for the routing and delivery of data packets across interconnected networks. This standard outlines how the Network Layer is internally organized to support a wide range of services and protocols for effective communication between open systems.