DSA Factory
Free The data link layer lessonsThe data link layer · Stage 2 · Sharing the wire · Step 1

Ethernet and CSMA/CD

See the Ethernet frame, and how stations sharing one wire listen, collide, back off and try again. About 14 minutes.

Quick check

In CSMA/CD, what does a station do after detecting a collision?

  1. AStops, sends a jam signal and waits a random time that grows with each collision before retrying
  2. BKeeps transmitting to finish the frame
  3. CRetries immediately
Show the answer

Stops, sends a jam signal and waits a random time that grows with each collision before retrying. Binary exponential backoff.

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4 questions on this idea

Short questions that apply the idea to new cases: trace it, work out a number, put steps in order. A wrong answer explains itself.

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