OSI reference model

1. Distinguish between the 7-layer reference model known as the OSI reference model and the 4-layer reference model known as the internet model or the TCP/IP model.

2. Define and describe the advantages and disadvantages of:

(a) a bus topology,

(b) a ring topology, and

(c) a star topology

3. Distinguish between physical data input and non-physical data input.


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