Computer Science Homework Help

I’m working on a computer science question and need an explanation and answer to help me learn.

The topology of a network infrastructure is critical to the operation of a computer system. Explore and discuss the following: 

1. What is the history of the network models? 
2. What are four layers of the TCP/IP Model and how are they used? 
3. How does the networking protocol work? Give at least one example based on literature