Course CurriculumCOMPUTER-NETWORKS(2nd)

Layering and Protocols Network Topology Encapsulation Multiplexing and Demultiplexing OSI Model TCP/IP model Basics of Physical Layer Internet Architecture Application Programming Interface Performance Metrics High-Speed Networks

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OSI Model

OSI Model
Seven layers: Physical, Data Link, Network, Transport, Session, Presentation, Application.
Standard reference model.
Each layer has a specific responsibility.
Helps in troubleshooting.

Year

OSI Model: Describe the sequence of events in each layer of the OSI model if the server is sending an encrypted file to the clients. Assume one client is on the same network as the server, and another client is on a different network. (10 marks)

Year

OSI Model: Application X on computer A sends a message to application Y on computer B. A and B are connected to LAN1 and LAN2, both connected to Router R1. Explain the data processing performed in every layer with respect to the OSI reference model. Use a diagram. (10 marks)

Year

OSI Model: Identify one or more layers of the OSI model that carry out each of the following responsibilities and explain them in detail: (i) transmission of bit stream across physical medium, (ii) defines frames, (iii) error correction and retransmission, (iv) reliable process-to-process message delivery, (v) route selection, (vi) provides user services such as e-mail and file transfer. (10 marks)