Which of the following devices is used to break up a broadcast domain?
  1. Switch
  2. Router
  3. Hub
  4. Bridge
Explanation
Answer: B - A router is used to break up broadcast domains.

Key Takeaway: A broadcast domain is a logical division of a computer network in which all nodes can reach each other by broadcast at the data link layer. It represents where a layer-2 broadcast will propagate. Switches forward a broadcast out all of the ports in the same VLAN as the receiving interface. The router breaks up a broadcast domain and drops these broadcast packets. This is vital to avoid broadcasts from every computer being sent across the entire network.
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