2. In relation to Application Layer protocols and using the example of a HTTP/I.I client application requesting and receiving the Homepage from the DIT webserver: (i) Explain the concept of Semantics in relation to the HTTP client and server applications communicating with each other. (6 marks) (ii) Explain the concept of Sytax in relation to the exchange of HTTP Request/Response messages. In your answer include a Protocol Box diagram to illustrate the basic structure of HTTP messages. (6 marks) PAGE 2 OF 6 (iii) For retrieval of the Homepage from the DIT webserver, construct an appropriate HTTP/I.I Request and Response message identifying and explaining any compulsoryecessary fields to ensure the applications will communicate with each other successfully. In your answer identify all termination strings and ignore non-compulsoryon-essential header fields. (8 marks)