How many functional layers are defined in the International Organization for Standardization (ISO) Open Systems Interconnection (OSI) reference model?
Answer and explanation
Correct answer: C. Seven layers
- Step 1: The OSI model specifies seven architectural layers from physical to abstract. Step 2. They are: Physical (1), Data Link (2), Network (3), Transport (4), Session (5), Presentation (6), and Application (7). Answer: Seven layers. Why not the others: Four layers define the TCP/IP model; five layers define the hybrid Internet model; six layers is not a standard protocol model.
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