As shown in the figure, the PPP link between R1 and R2 is not in the same network segment, but the R1 and R2 direct connectors can communicate, and the Ethernet link cannot communicate under the same planning, why?

Question

As shown in the figure, the PPP link between R1 and R2 is not in the same network segment, but the R1 and R2 direct connectors can communicate, and the Ethernet link cannot communicate under the same planning, why?

nico farina · Accepted Answer

The interconnect POS ports of R1 and R2 learn the 32-bit host route for each other's direct connections through IPCP

nico farina · Accepted Answer

The data packets of the interconnect POS ports of R1 and R2 do not need to encapsulate ethernet headers and do not need to use ARP to request MAC addresses

nico farina · Answer

The interconnect POS ports of R1 and R2 learn the 24-bit subnet route of each other's direct connection ports through IPCP

nico farina · Answer

The interconnect POS port of RI and R2, through LCP learns the MAC address of the opposite termination , does not need to use ARP to request the MAC address