Q1Data Communication and Computer Networks
Question
10 marks
(a) Discuss the OSI reference model in detail. (b) Explain the functions of each layer.
Answer
7 layers from Physical to Application.
The OSI model standardizes network functions:
- 1. Physical: Bits to signals on media.
- 2. Data Link: Error-free frames, MAC.
- 3. Network: Routing, logical addressing (IP).
- 4. Transport: End-to-end reliability, port numbers.
- 5. Session: Establish, maintain, terminate sessions.
- 6. Presentation: Data translation, encryption.
- 7. Application: Network services for users.
