In the DoD model, which layer corresponds to the Network layer of the OSI model?

In the DoD (Department of Defense) model, often referred to as the TCP/IP model, the layer that corresponds to the Network layer of the OSI model is the Internet layer. This is the primary reason why the correct answer is the Internet layer.

The Internet layer is responsible for addressing and routing packets of data across the different networks, which aligns directly with the functions defined at the Network layer in the OSI model. This layer provides protocols such as IP (Internet Protocol) that manage the forwarding of packets and provide logical addressing.

Understanding the DoD model in relation to the OSI model is important for network design and troubleshooting because it helps clarify the roles and responsibilities of various layers in network communications. In contrast, the other layers in the DoD model serve different purposes: the Application layer deals with end-user services, the Host-to-Host layer (also known as the Transport layer) manages end-to-end communication and data flow control, and the Network Access layer encompasses the physical and data link functions.