medium access control

Question

1. Consider a CSMA/CD network running at 10 Mb/s with the following operational setting:

   • Interframe Gap (IFG) = 96-bit times

   • Jam signal = 48-bit times

   • The signal speed in the cable is 2×108 m/s

     There are two hosts P and Q attached to this CSMA/CD network, and they are 1200 meters apart.
     Suppose P wants to transmit a frame of 100 bytes at T = 0 and Q wants to transmit a frame of 200 bytes at T = 5 s. Assume the network was idle before the two transmission events.

     Answer the following questions. Briefly justify your answers.

     1. (6%) When will P and Q detect the collision?

     2. (3%) When will P and Q stop the transmission due to the collision?

     3. (3%) When will P and Q notice that the network turns idle after the collision?