In a switched Ethernet network, which statement about collision domains is correct?

• A. A collision domain spans multiple switches.
• B. In switched Ethernet, each switch port creates its own collision domain.
• C. Collision domains disappear on all networks.
• D. Routers create collision domains.

Answer: (B)

In switched Ethernet the idea of microsegmentation is at work: each switch port creates its own collision domain. That means the link from the switch to a device on one port is isolated from the links on other ports, so collisions cannot occur across different ports. In practice, many modern switches operate in full duplex, which also means no collisions happen on a link, reinforcing that each port acts as its own collision domain. The other statements conflict with how switches partition collision domains: a collision domain does not span multiple switches, collision domains don’t disappear on all networks, and while routers do create separate collision domains at their interfaces, the question is specifically describing switched Ethernet behavior, where per-port collision domains is the defining concept.