Which layer establishes paths for data transfer and uses routers and IP addresses?

Which layer establishes paths for data transfer and uses routers and IP addresses?

• A. Network Layer
• B. Application Layer
• C. Transport Layer
• D. Data Link Layer

Answer: (A)

The network layer handles routing and logical addressing, establishing paths for data transfer. Routers operate at this layer, using the destination IP address in each packet to forward it toward the destination, guided by routing tables and protocols to find the best path. IP addresses are assigned and used at this layer to identify networks and hosts across different networks. In contrast, the data link layer deals with local delivery using MAC addresses, the transport layer provides end-to-end reliability and port-based multiplexing, and the application layer handles user-facing protocols.

The network layer handles routing and logical addressing, establishing paths for data transfer. Routers operate at this layer, using the destination IP address in each packet to forward it toward the destination, guided by routing tables and protocols to find the best path. IP addresses are assigned and used at this layer to identify networks and hosts across different networks. In contrast, the data link layer deals with local delivery using MAC addresses, the transport layer provides end-to-end reliability and port-based multiplexing, and the application layer handles user-facing protocols.