In the TCP/IP model, which layer is responsible for routing packets between networks?

The Internet Layer is responsible for routing packets between networks in the TCP/IP model. This layer provides the means for sending data packets between devices across diverse networks, ensuring that they reach their intended destination based on logical addressing, such as IP addresses. It performs the critical function of encapsulating packets and is also responsible for packet forwarding, which involves making decisions about the best path for data to traverse through intermediary routers to reach its destination. Protocols that operate at this layer, such as Internet Protocol (IP), play a fundamental role in achieving effective network communication.

The other layers serve different purposes: the Application Layer focuses on end-user application and interface protocols, the Transport Layer ensures end-to-end communication between devices and manages data flow with protocols like TCP and UDP, while the Link Layer deals with the physical addressing and the actual transmission of data over a specific physical medium. Each layer has its distinct role, but it is the Internet Layer that specifically facilitates the routing between different networks.