Question 2.1 Using the hybrid 5 layer model as your framework, model the following network scenario with a diagram. You need to draw and name the layers (sub-layers not required) and protocols involved, and indicate protocol interactions using dotted lines. Show also the actual path taken by the data between systems A and B. System A is communicating with system B using the HTTP protocol, which in turn requires the TCP / IP protocols. A and B are both connected to a public data network with routers R1 and R2 which runs IPv4. A is connected to R1 through an Ethernet switch E, and B is connected to R2 directly. Both A and B runs IPv6 and hence need to tunnel through the public data network. R1 and R2 use a data link layer protocol X. (10 marks) Question 2.2 For the network in question 2.1, draw the correct protocol headers for a message in the physical link between R1 and R2 in the following format: Protocol Protocol header 1 header 2 .... Protocol header n Data (5 marks)