““172.16.1.51 and vice versa. You can reasonably assume that the switches learned the MAC addresses of the router and the host, adding those to the MAC address tables. Host A and Router R1 completed the ARP process and list each other in their respective Address Resolution Protocol (ARP) tables. The failure of a ping, even with two devices on the same subnet, can point to a variety of problems, like those mentioned in this list.””
