Which device is used to regenerate and relay signals to extend transmission distance?

• A. Amplifier
• B. Repeater
• C. Router
• D. Switch

Answer: (B)

Extending transmission distance relies on restoring a clean signal after it has degraded over the run. A repeater does exactly that: it receives the incoming signal, regenerates it to its proper, original form, and then retransmits it onward. This cleanup prevents the amplified noise from accumulating and allows the signal to travel much farther.

An amplifier, by contrast, only increases the signal’s strength and often also boosts the noise and distortion that have built up along the way, so it doesn’t reliably extend usable distance. Routers and switches operate at higher layers to direct traffic between networks or within a local network, but they aren’t used to extend a single physical connection by regenerating and relaying the signal.