Question

Assume that four hosts connected to an Ethernet have been involved in a number of collisions, and in addition at time T all of them have detected a new collision. The table below lists the number of successive collisions that each host has been involved in including the current collision. Let the slot time be 1 time unit, and assume that the collision occurred in slot 0. Treat collisions as taking one time slot. Assume that host A decides to make its retransmission attempt in slot 1. What is the probability that A’s transmission in slot 1 is successful? (Notice that host A is transmitting in slot 1. If host A transmits in a different slot the problem is more complicated because it depends on which nodes transmitted in earlier slots and if they were successful or not).

Host	collision count
A	5
B	2
C	3
D	4

Answer 1