What model is constructed using a four-layer approach and is essential for ensuring data reaches the correct device on a network?

The TCP/IP Model is constructed using a four-layer approach, consisting of the Link Layer, Internet Layer, Transport Layer, and Application Layer. This model is foundational for ensuring that data is properly addressed, routed, and delivered across different devices on a network.

The four layers work together to provide structured communication protocols that facilitate data exchange over both local networks and the broader internet. Each layer has specific functions: the Link Layer deals with the physical aspects of the network, the Internet Layer is responsible for addressing and routing packets, the Transport Layer ensures reliable data transfer, and the Application Layer deals with high-level protocols that directly support end-user applications.

This structured approach is particularly crucial as it defines how data should be packaged, transmitted, and received, ensuring that messages reach the correct destination device effectively.