Fig. Q2 shows a network with links running different data-link layer protocols. Suppose that host A is sending an IP datagram to host B via routers R1 and R2. The MTU of the links L1, L2 and L3 are, respectively, 1620 bytes, 820 bytes and 1620 bytes. The first 10 bytes of the original IP datagram header is 4500 074E 0003 0000 2006. Given: IP header VER HLENS Service type Total length bis 4 bits l6 bits 13 bils 6 bits lo-live 8 bits 8 bits Source IP address (32 bits) Destination IP address [32 bris) Options+ padding O to 40 bytes) (a) What is the header size of the original IP datagram? (2 marks) (b) What is the size of the data contained in the original IP datagram? (2 marks) (c) How many routers can the original IP datagram travel to? (2 marks) (d) Describe the fragmentation process from host A to R1. Determine the first 8 bytes of all the fragments along the link L1. You may express part of your answer in decimal or binary form. (8 marks) (e) Describe the fragmentation process from host R1 to R2. Determine the first 8 bytes of all the fragments along the link L2. You may express part of your answer in (8 marks) (f) Describe the fragmentation process from host R2 to host B. Determine the first 8 decimal or binary form. bytes of all the fragments along the link L3. You may express part of your answer in decimal or binary form. (3 marks) R1 R2 L1 R3 Fig. Q2