Which statement is true about collision domains on a switched network?

• A. Switches Maximize Collision Domains.
• B. Routers And Switches Break Up Collision Domains.
• C. Hubs Eliminate Collisions.
• D. Collision Domains Only Exist In Wireless Networks.

Answer: (B)

A collision domain is the part of a network where two devices could transmit at the same time and cause a collision. On a switched network, each port of a switch creates its own collision domain, so devices connected to different ports don’t contend for the same shared medium. Routers do the same at the interface level—each router interface is its own collision domain. Because both switches and routers isolate transmissions to separate segments, the statement that routers and switches break up collision domains is true.

Hubs don’t break up collision domains; they extend a single collision domain to all connected devices, so collisions can involve everyone on the hub. And collision domains aren’t exclusive to wireless networks—wired networks using shared segments (like hubs or half‑duplex links) also have collision domains, though switches and routers reduce them.