A router works at which layer of Open Systems Interconnection (OSI)

A router works at which layer of Open Systems Interconnection (OSI) model?

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Physical layer

Data link layer

Network layer

Application layer

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UPSC CBI DSP LDCE – 2023

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The correct answer is C) Network layer.

Routers are network devices that primarily operate at the Network layer (Layer 3) of the OSI model. They use logical addresses (like IP addresses) to determine the best path for forwarding data packets across different networks.

The Physical layer (Layer 1) deals with the physical transmission of data (e.g., cables, connectors, signal voltage). Devices at this layer include hubs and repeaters. The Data Link layer (Layer 2) handles framing and addressing within a local network segment using physical addresses (like MAC addresses). Devices at this layer include switches and bridges. The Application layer (Layer 7) is where network applications reside and interact with the network service.

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