Is it true that each port on a switch is a separate collision domain?

• A. True
• B. False
• C. Depends on VLANs
• D. Depends on speed

Answer: (A)

Collision domains are the portions of the network where two devices could collide if they transmit at the same time. A switch creates a separate collision domain for each of its ports, so each device connected to a different port has its own dedicated domain. That means traffic on one port doesn’t contend with traffic on another port, eliminating collisions between devices on different ports. In modern networks, switches typically run full-duplex links, so collisions don’t occur at all, but the boundary concept stays: every switch port defines its own collision domain. VLANs organize traffic into separate broadcast domains, but they don’t merge collision domains across ports, and speed doesn’t change this boundary since collisions are a concern of the shared medium, not simply the link rate.