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Internetworking - Technical MCQs

Q1:

How does a host on an Ethernet LAN know when to transmit after a collision has occurred?
  1. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
  2. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
  3. You can improve the CSMA/CD network by adding more hubs.
  4. After a collision, the station that detected the collision has first priority to resend the lost data.
  5. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.

A 1 and 3

B 2 and 4

C 1,3 and 4

D 2 and 5

ANS:D - 2 and 5

Once transmitting stations on an Ethernet segment hear a collision, they send an extended jam signal to ensure that all stations recognize the collision. After the jamming is complete, each sender waits a predetermined amount of time, plus a random time. After both timers expire, they are free to transmit, but they must make sure the media is clear before transmitting and that they all have equal priority.