Router Functionality:Routers operate at the Network Layer (Layer 3) of the OSI model. They use IP addresses to forward packets between different networks and determine the best path for data transmission based on routing tables.
Analysis of Options:
Option A: "Network layer" is correct, as routers are Layer 3 devices.
Option B: "Transport layer" handles end-to-end communication and reliability (e.g., TCP/UDP), not routing.
Option C: "Data link layer" is for local node-to-node data transfer (e.g., MAC addresses), handled by switches.
Option D: "Application layer" is for user-facing software interactions (e.g., HTTP, FTP).
Correct Answer:Routers work at the A (Network layer).
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