REFERENCE MODELS You are required to do independent reading on the Open System Interconnection (OSI) and Transmission Control Protocol/ Internet Protocol (TCP/IP) reference models. You should be able to answer the questions below as you study this topic. a) What is a reference model? b) Give advantages of reference models c) Compare the OSI and TCP/IP reference models d) Using the OSI reference model, state the communication functions or processes at each layer. e) What are the Protocol Data Units at each layer of the OSl and TCP/IP reference models f) Explain how an email message would be processed and encapsulated for network transport (transmission) Note to Students: Ensure that you get an in depth understanding of these parts of your course work. Assessment will be done through a Quiz. Recommend some best books with a lot of examples