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.
Exam with this question: CCNA Exploration 2: ERouting Final Exam
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