Discussion
If a network designer wants to connect 5 routers as point-to-point simplex line, then total number of lines required would be
Answer: B
Correct answer: 20
A simplex line carries traffic in one direction only, so each pair of routers needs two of them - one each way. With 5 routers there are \( 5\times 4 = 20 \) ordered pairs, and so 20 lines. Full-duplex lines would need only \( \binom{5}{2}=10 \).
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