Which device reduces collision domains by segmenting traffic?

• A. Hub
• B. Repeater
• C. Switch
• D. Bridge

Answer: (C)

Collision domains are the network segments where a collision could occur if two devices transmit at the same time. Devices that segment traffic reduce the size of these domains. A switch creates a separate collision domain for each connected port, so traffic from one device on a port stays in its own little lane and doesn’t collide with devices on other ports. That per-port isolation is what makes switches effective at reducing collisions and improving efficiency, especially as networks grow.

Hubs don’t reduce collision domains because they simply repeat signals to all ports, causing every device on the hub to share one collision domain. Repeaters also don’t segment traffic; they just extend the physical signal. Bridges do segment collision domains by linking separate LAN segments, but switches implement this on many ports and are the common, scalable solution in modern networks.