CompTIA Network+ Exam Review

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.