Which device breaks collision domains on a per-port basis?

Which device breaks collision domains on a per-port basis?

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

Answer: (D)

Collision domains are the network segments where collisions can occur when multiple devices send at the same time. A hub does not separate these domains; it acts as a repeater, so all devices connected to it share a single collision domain. A switch, however, creates a separate collision domain for each port, isolating traffic so transmissions on one port don’t collide with traffic on another. This per-port segmentation is what keeps collisions contained and supports full-duplex operation on modern Ethernet links. While routers and bridges also segment traffic between networks or segments, the specific per-port collision-domain isolation is a hallmark behavior of a switch. That’s why this device is the correct choice.

Collision domains are the network segments where collisions can occur when multiple devices send at the same time. A hub does not separate these domains; it acts as a repeater, so all devices connected to it share a single collision domain. A switch, however, creates a separate collision domain for each port, isolating traffic so transmissions on one port don’t collide with traffic on another. This per-port segmentation is what keeps collisions contained and supports full-duplex operation on modern Ethernet links. While routers and bridges also segment traffic between networks or segments, the specific per-port collision-domain isolation is a hallmark behavior of a switch. That’s why this device is the correct choice.