CSMA/CA Flashcards
What is the first step in the CSMA/CA process?
Computer with data to send listens for data signal.
What does a computer do if it detects another transmission in progress?
Continue to wait.
What signal does a computer send when no data signal is present?
Request to Send / RTS.
What could happen if two computers detect no data signal at the same time?
Both could start transmitting simultaneously.
What signal does the receiver/WAP send in response to RTS?
Clear to Send / CTS signal.
What is the purpose of the RTS/CTS signal?
Blocks any other transmissions from nodes in range (for a specified time).
What action should be taken after receiving CTS?
Start to transmit.
What should a computer do if it does not receive CTS?
Continue to wait (until transmission ends).
What does the receiver send after all data is received?
Acknowledgement / ACK.
What does the transmitter do after transmitting?
Wait to receive acknowledgement packet.
What happens if no ACK is received within a reasonable time period?
Wait a time period and then listen again / retransmit.
What does the acknowledgement / ACK notify other computers?
They can transmit again.
How are waiting periods typically characterized?
Often random.
Can collisions be detected by the transmitter in CSMA/CA?
No.
