Ключевые слова:
Open systems interconnection, Network layer (OSI), Data processing, Telecommunication, Communication networks, Computer networks, Connectionless-mode (OSI), Digital circuits, Computer circuits, Information exchange, Data transmission, Communication procedures, Conformity, Identification methods, Addresses (data processing), Packet switching networks, Telephone numbers, Circuit switching networks, Circuit networks, ISDN, Protocols, Network services, Protocol implementation conformance statement, PICS, Public networks