Which layer of the TCP/IP model is responsible for delivering packets across multiple networks?

The Internetwork Layer of the TCP/IP model is responsible for delivering packets across multiple networks. This layer is crucial for routing packets between different networks and ensuring that they reach their intended destination. It handles the addressing of devices and the management of packet forwarding between routers, which connect different segments of a network.

In this layer, protocols such as Internet Protocol (IP) operate to facilitate the efficient delivery of packets. IP provides the necessary mechanisms for assigning unique addresses to devices on a network and for determining the best path to transmit packets from one network to another.

By performing these functions, the Internetwork Layer enables communication across diverse networking technologies and structures, making it a vital component of the overall TCP/IP model. Other layers, such as the Transport Layer, manage end-to-end communication and data transfer, while the Application Layer takes care of application-specific data handling. The Network Interface Layer deals with the physical transfer of data over a specific medium, but it does not concern itself with routing packets between multiple networks.