Which protocol can be used by Router1 to determine the IP address of Router2 when they are directly connected and only layer 2 connectivity exist between them?
Answer = ARPMeaning of ARP - "Address Resolution Protocol", is used to map IP Network addresses to the hardware (Media Access Control sub layer) addresses used by the data link protocol. The ARP protocol operates between the network layer and the data link layer in the Open System Interconnection (OSI) model.