Discussion
If a designer wants to design a point-to-point subnetwork with 10 routers of full duplex line, then total number of lines among them would be
Answer: D
Correct answer: 45
A full-duplex line carries both directions, so one line serves each pair of routers:
\[ \binom{10}{2} = \frac{10\times 9}{2} = 45 \]
It would take 90 lines only if each were simplex and a separate one were needed for each direction.
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