Which layer of the OSI model is responsible for routing data?

The Network Layer of the OSI model is responsible for routing data. This layer is essential for determining the best path for data packets to travel across a network. It handles the address mechanisms necessary for data routing, such as IP addressing, and is responsible for packet forwarding, which includes the tasks of routing, traffic control, and fragmentation.

When data is sent over a network, routers operate at this layer to identify the most efficient routes for the data to reach its destination. This includes not only the physical devices involved but also the logical addressing that enables devices to communicate with one another across various networks.

While other layers play critical roles in the OSI model, the Network Layer’s specific function of managing and controlling data routing makes it the correct answer in this context. The Data Link Layer focuses on node-to-node data transfer and error detection, the Transport Layer ensures end-to-end communication and reliability, and the Application Layer interacts directly with software applications. Each of these layers has distinct responsibilities, but routing explicitly falls under the purview of the Network Layer.