Practice Quiz

Advanced Networking Administrator Test Prep

Category - CCNA

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What does the jam signal on an Ethernet segment signify?
  1. It indicates a physical problem on the wire.
  2. It indicates congestion on the network.
  3. It indicates that the server is down.
  4. It indicates a collision on the wire.
Explanation
Answer: D - A jam signal indicates a collision on the wire.

Key Takeaway: A jam signal usually occurs on an Ethernet segment, typically on a CSMA/CD network. A jam signal carries a 32-bit binary pattern sent by a computer to inform the other computers that they must not transmit. After sending the jam signal, each of the senders will wait a random amount of time before beginning the entire process over. The random time helps to ensure that the two devices don't transmit simultaneously again.
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