4) Link layer (and network layer) addressing and forwarding (10pts) Consider the figure below. The IP and MAC addresses are shown for nodes A, B, C and D, as well as for the router's interfaces. 91-52-3-00-22-60 128.119.16.253 3F-5A-09-00-31-7 128.119.16.80 EB-20-FA-OR-FE-F4 120.119.92.145 B (6) F9-44-58-FDBC- 128.119.185.47 (1) (2) (5) (4) C6-13-14-58-04-48 128.119.92.137 25-87-88-90-C9-ED 128.119.92.202 09-FF-D-FC-F8 128.119.185.219 . | $ Consider that B and C have already communicated before and assume that a new IP datagram is being sent from node B to node C. While this packet is traveling, indicate: 1- What is the source MAC address at point 3? 2- What is the destination MAC address at point 3? 3- What is the source IP address at point 3? 4- What is the destination IP address at point 3? 5- What is the source MAC address at point 2? 6- What is the destination MAC address at point 2? 7- What is the source MAC address at point 4? 8- What is the destination MAC address at point 4? 9- Do the source and destination MAC addresses change at point 5? Answer with yes, no, or N/A. 10- Do the source and destination MAC addresses change at point 6? Answer with yes, no, or N/A 3F-5A-09-00-31-F6 128.119.16.80 91-52-3E-80-2E-BO 128.119.16.253 EB-AO-FA-OA-FE-F4 128.119.92.145 (6) F9-A4-5B-FD-BC-59 128.119.185.47 (3) (1) (2) (5) . D 25-87-88-90-C9-ED 128.119.92.202 06-13-14-58-A4-48 128.119.92.137 D9-FF-7D-FC-E8-67 128.119.185.219