As a CCNA candidate, you will be expected to know the OSI model very well. Why does the data communication industry use the layered OSI reference model? (Choose two.)
A. It provides a means by which changes in functionality in one layer require changes in other layers.
B. It encourages industry standardization by defining what functions occur at each layer of the model.
C. It supports the evolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers.
D. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting
Answer: B,D