REFER TO THE EXHIBIT. A PING BETWEEN THE SERIAL INTERFACES OF R1 A...
10. Refer to the exhibit. A ping between the serial interfaces of R1 and R2 is successful, but a ping between their FastEthernet
interfaces fails. What is the reason for this problem?
The FastEthernet interface of R1 is disabled.
One of the default routes is configured incorrectly.
A routing protocol is not configured on both routers.
The default gateway has not been configured on both routers.