【单选题】The OSI(66)model, sometimes also called ISO or 7 layers reference model for communication, has been developed by the International Standards Organization in early 1980's.
【单选题】●The OSI (68) model,sometimes also called ISO or 7 layers reference model for communication.has been developed by the International Standards Organization in early 1980's. (68)
【单选题】In the open systems interconnection (OSI) reference model, 'layer' means one of seven conceptually complete,(71) arranged groups of services, functions, and protocols, that extend across all open syst...