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Which of the following is true about the CSMA/CD process? (Choose two.)
After a collision occurs, devices independently choose a random time to wait before trying to transmit again.
After a collision occurs, devices must synchronize to find a predetermined time to wait before trying to transmit again.
Multiple hosts can transmit data simultaneously.
The algorithm never permits collisions to happen.
The hosts must wait until the media is not in use before transmitting.
Half-duplex networks use CSMA/CD to avoid collisions, it follows this steps :
1. A device that has a frame to transmit, listens until the Ethernet is not busy.
2. When the Ethernet is not busy, the device can proceed to send the frame.
3. The device listens to discover if any collision occurs. If a collision occurs:
a. Every device sends a jamming signal, that tells all devices that a collision just occurred.
b. Every device independently choose a random time to wait before trying to transmit again.
4. The next attempt starts again at step 1.
For more information refer to: [Odom W. - Cisco CCENT - CCNA ICND1 100-101 Official Certification Guide, Chapter 2]
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