Which layer of the OSI model is primarily focused on logical addressing and routing?

The Network Layer of the OSI model is primarily concerned with logical addressing and routing. This layer is responsible for determining how data packets are transmitted across networks. It provides logical addressing through IP addresses, which allows different networks to communicate with each other.

When a packet is sent from one host to another across diverse networks, the Network Layer determines the best path for it to take based on routing protocols and algorithms. This ensures that data is directed through various routers until it reaches its final destination. Additionally, the Network Layer is involved in packet forwarding and addressing, making it essential for establishing communication between devices that are not on the same local network.

In contrast, the other layers serve different functions: the Data Link Layer handles node-to-node data transfer and physical addressing, the Session Layer manages sessions between applications, and the Physical Layer is concerned with the transmission of raw bitstreams over a physical medium. Each layer has its distinct responsibilities that contribute to the overall function of the OSI model, but logical addressing and routing are the primary focus of the Network Layer.