Consider the sample network shown below where three LANS (LAN1, LAN2 and LAN3) are interconnected by two routers (R1 and R2). 111.111.111.111 A B CD LAN 1 R1 X 123.111.2.1 LAN 2 D R2 E 222.222.222.222 LAN 3 G F (a) Assume that IPv4 addresses for hosts A, D and G are given as 111.111.111.111, 123.111.2.1 and 222.222.222, respectively. Assign appropriate IPv4 addresses to all hosts and routers in the network. [14 marks] (b) Consider an HTTP client at A that wants to retrieve a web document that resides at the server G. The IP address of the web server G is initially unknown. Besides HTTP, what transport and application layer protocols are needed in this scenario?