A 2 km long broadcast LAN has 107 bps bandwidth and uses

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A 2 km long broadcast LAN has 10⁷ bps bandwidth and uses CSMA/CD. The signal travels along the wire at 2 × 10⁸ m/s. What is the minimum packet size that can be used on this network?

1. 50 bytes
2. 100 bytes
3. 200 bytes
4. None of these

Correct Option: D

Now, Distance = Speed × Time
⇒ 2 × 10³ = 2 × 10⁸ × Time
⇒ Time = 10^(–5)s or 10 × 10^{– 6} s or 10 μs
Minimum Packet size = λ × Time
= 10⁷ × 10 × 10^{– 6} = 100 bits = 12 Byte