CN Ethernet Question

[Mayur Mahrotri]

Q. Nodes A and B are connected by a 100 Mbps Ethernet segment with 6 micro second propagation delay between them. Suppose A and B send frames at t=0 and frames get collided. After first collision A draws k=0 and B draws k=1(exponential backoff algorithm). If jam signal is ignored and timeout time is one RTT then at what time A's packet gets completely delivered to B? Assume packet size is of 1000 bits.

(A) 28 micro seconds (B) 16 microseconds (C) 22 microseconds (D) 38 microseconds

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With Regards,
Mayur.

[Sachin Patil]

for Ethernet CSMA/CD,

Transmission time of frame >= 2 x one way Propagation delay, this should hold.

This condition is not satisfied here.

[Mayur Mahrotri]

Assume anything that holds true and solve. Just tell me the approach.

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With Regards,
Mayur.

[Mayur Mahrotri]

Can someone please tell me what exactly is the concept of propagation delay and when the frame is transmitted, where does this time come into picture? When do we add RTT time = 2 x Propagation delay and when do we add RTT/2 time, i.e. single way propagation delay ?

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With Regards,
Mayur.