GATE CS 2016 Set 2 — Question 24
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Algorithms → Dynamic Programming → Floyd-Warshall
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Question
The Floyd-Warshall algorithm for all-pair shortest paths computation is based on
Correct answer
(C) Dynamic Programming paradigm.
Solution
In CSMA/CD (Carrier Sense Multiple Access with Collision Detection):
1.Carrier Sense: A station listens to the channel before transmitting. If the channel is busy, it waits.
2.Collision Detection: A station listens while transmitting. If it detects a collision (signal energy spike), it stops transmitting the data packet and sends a jamming signal.
- Option (A) is false because the station must sense the channel during transmission to detect collisions.
- Option (C) is false because the station stops transmitting the packet as soon as a collision is detected.
4.Exponential Backoff: After a collision, the station waits for a random amount of time chosen from an interval , where is the number of attempts. As increases, the interval grows exponentially, which spreads out the retransmission attempts of colliding stations and reduces the probability of another collision. Thus, Option (D) is true.
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