Respuesta :
Answer:
R1
Explanation:
Tracert is what is used in tracing the path taken by a packet. The successful reply is from the first device which is on the same LAN path as the host from where it is sent. The first device is R1 which is the default gateway of router. Therefore, the trouble shooting should begin from R1.
There is an attached document showing the diagram.

Answer:
The administrator should start troubleshooting at R1.
Explanation:
Normally in this circuit, the tracert is used to trace the path a packet takes. The only successful response was from the first device along the path on the same LAN as the sending host. The first device is the default gateway on router R1. The administrator should therefore start troubleshooting at R1 because it is the default gateway.