Which statement correctly describes the operation of CSMA/CD?

Which statement correctly describes the operation of CSMA/CD?

• The end device waits until it receives a token then transmits the data.
• The end device waits until there is no carrier signal, transmits a token, then transmits the data.
• The end device waits until there are no data signals then transmits the data while listening for collisions.
• The end device waits until there are no data signals, sends a notification that it is going to use the media, then transmits the data.

Explanation: Nodes using carrier sense multiple access with collision detection (CSMA/CD) wait until the media is not being used before sending data. They will then listen for signals from other nodes that may indicate that a collision has occurred. If a node is using collision avoidance (CSMA/CA), it will notify the other nodes of its intent to transmit data to prevent a collision. Controlled access techniques, such as token passing, do not experience collisions.

Exam with this question: Module 2.3.3 Data Link Layer Quiz