Red Seal Electrician Practice
Signalling and communicationQuestion 243 of 1506

Why can a bus network be a data security issue?

  1. Only the master node can hear messages
  2. Each node has its own private wire
  3. All nodes can hear every message
  4. Messages are sent only as light
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Correct answer: All nodes can hear every message

A bus carries all traffic for all nodes on one set of wires. This is called broadcast networking.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 14.6: Network Topology

Practice signalling and communication

Questions last reviewed: 18 October 2026