Match List I (Data transmission modes in a computer network) with List II (Description) and choose the correct answer from the options given below.

List I

i.Simplex

ii.Duplex

iii.Half-duplex

List II

a.Data can be sent and received at the same time

b.Data can only be sent or received

c.Data can be sent and received but not at the same time

Ai-c, ii-a, iii-b

Bi-a, ii-c, iii-b

Ci-b, ii-c, iii-a

Di-b, ii-a, iii-c ✓ Correct

Correct answer: (D) i-b, ii-a, iii-c

Explanation

Simplex transmission allows data to be only sent or only received, in one direction.

Duplex, or full duplex, allows data to be sent and received at the same time.

Half-duplex allows data to be sent and received but not at the same time.

This pairs simplex with one-way flow, duplex with simultaneous two-way flow and half-duplex with alternating two-way flow.

A radio broadcast is simplex, while a telephone call is full duplex.

A walkie-talkie is a familiar example of half-duplex working.

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