[8] [5 points] (1) When host A sends a packet to host B, you should give the source and destination addresses in the IP header and the MAC header of the packet when it travels on its first hop and second hop, respectively. (2) When host B sends its reply packet back to host A, again, you should give the source and destination addresses in the IP header and the MAC header of the reply packet when it travels on its first hop and second hop, respectively