I have question for CSMA/CD
assume,
1. Node : 7 nodes(A,B,C,D,Y,X,Z)
2. maximum distance : 10 km (A to Z is 10km, rests are below 10km)
3. transmission speed : 10Mbps
Q1. The distance between Node A and Node Z is 10 km. A few seconds after A starts sending data
Will Z begin to receive? The propagation speed of electric signal power is 200,000 km / sec.
Q2. use Q1, How many bits will A send?
Q3. After A starts to send data, until Z (Q1) times elapses, Z sends A
I can not detect if I am new. So each island is sending data to another island
After sensing (CS, carrier sense), it is judged that the other island is not sending data
If there was an island that sent data just before (Q1) even if it started to send data,
Station data conflict occurs. Thus, each island has a carrier sense,
It is determined that the data is not transmitted, and after a few seconds since the start of data transmission,
Should I wait for collision detection or collision detection?
Q4. After I started transmitting data, I checked whether there was a collision during (Q3) times.
If there is no collision during the transmission,
Data collision can not occur even if it is transmitted. Briefly explain why.
Q5. If the data is transmitted for a time shorter than the collision check time (Q3) and terminated
That is, less than the amount of data that can be transmitted during the collision check time
The collision is checked only during transmission, and if there is no collision during the transmission, the transmission is successful
And should not be terminated. Briefly explain why.
Q6. Therefore, once you start to transmit, you must transmit and terminate at least a few bits of data
end?
Q7. If you confirm that a collision has occurred after starting transmission,
Would it be appropriate?
Q8. Once you see that a collision has occurred, you can stop sending data and take action (Q7) above
You will have to try sending the data again. At this time, the retransmitted islands
How long do you want to wait and start sending again? Of course,
CSMA / CD protocol.
Thank you
