The number of layers in ISO OSI reference model is __________
A. 4
B. 5
C. 6
D. 7
Answer:D
The number of layers in ISO OSI reference model is __________
A. 4 B. 5 C. 6 D. 7
Explanation: In OSI reference model, there are 7 layers namely Application, Presentation, Session, Transport, Network, Data Link and Physical layer. Each layer uses a protocol to perform its designated function, for example, the data link layer uses error detection protocols for error control functions.