A repeater works at which of the following layers in the OSI model?

Correct option is A

A repeater is a hardware device that operates at the Physical Layer of the OSI model. It is used to regenerate and amplify signals to extend the transmission distance. Repeaters are crucial for ensuring that signals maintain their strength and integrity over long distances in a network.
Important Key Points:
1. Physical Layer Functionality: Repeaters work at the Physical Layer because their primary job is to deal with the transmission and reception of raw bitstreams without any concern for addressing, error detection, or data formatting.
2. Signal Regeneration: The repeater amplifies and regenerates signals to combat signal attenuation (weakening) over long distances.
3. Use Case: Repeaters are commonly used in wired networks like Ethernet and fiber optic cables.
Knowledge Booster:
· Data Link Layer: Responsible for error detection, error correction, and framing. Devices like switches operate at this layer.
· Network Layer: Handles routing and addressing, with devices like routers working at this layer.
· Transport Layer: Ensures end-to-end communication, using protocols like TCP and UDP.
· Application Layer: The top layer where user applications interact with the network, such as web browsers and email clients.