hapter 1: Introduction to Data Communications Why are network layers important in data communications network? What would be a drawback in using layered network model List the five layers of the Internet network model (or the seven layers of the OSI network model) and explain what each layer does for data communications. You need to also give at least one example protocol (e.g., POP) for each layer. Explain how a message is transmitted from one computer to another using layers (e.g the five layers in the Internet model). Be sure to explain how PDUs at different layers are created (organized) at the sender's end and processed at the receiver's end 1. 2. 3