1.2. DOD Models and its function
DOD Model maps to OSI model as below:
IP is the protocol that works at Internet layer. It forwards the packets based on the network address (IP address) in the packets and the routing tables.
The four layers of DoD model from Top to Bottom are:
1. Process Layer: Responsible for implementation of user-level applications such as mail delivery, file transfer, and remote login.
2. Host-to-Host Layer: Responsible for flow control,and re transmission of lost packets. TCP, and UDP protocols work at this layer.
3. Internet Layer: Responsible for routing data across a network of networks. Routed protocols such as IP work at this layer. Routing protocols are also associated with this layer.
4. Network Access Layer: Responsible for the delivery of data segments over a given particular hardware media. Different protocols such as CSMA/CD work at this layer.
More Information :