QUESTION 1
(a) State the OSI layers where segments, bits, frames and packets are handled (2 Marks)
(b) Identify any THREE levels of synchronization that are applicable in data communication (3 Marks)
(c) Outline THREE elements of Data communication system (3 Marks)
(d) Outline FOUR forms of information that can be transmitted using a data communication channel (4 Marks)
(e) Classify the following transmission media as either guided or unguided
(i) Infrared
(ii) Coaxial cable
(iii) Multimode graded – index fibre
(iv) Laser (4 Marks)
(f) With the aid of a diagram describe the following
(i) Half duplex
(ii) Full duplex (4 Marks)
(g) (i) Define parallel data transmission as applied in data communication
(ii)Explain TWO limitations of parallel data transmission (5 Marks)
(h) State any TWO meaning of the term modulation as applied in data communication
(ii)State any TWO advantages of Delta Modulation DM over Pulse Code Modulation PCM
(iii)State any limitation of DM (5 Marks)
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