Refer to the exhibit. A network administrator has a connectivity problem between the serial interfaces of Merida and Vargas. What is the cause of the problem?

Refer to the exhibit. A network administrator has a connectivity problem between the serial interfaces of Merida and Vargas. What is the cause of the problem?

• Authentication is required on the serial link.
• The encapsulation is misconfigured.
• The IP addresses are on different subnets.
• The serial interface on Vargas is shutdown.
• The loopback interfaces on both routers are not configured.

Exam with this question: CCNA Discovery 3: DRSEnt Chapter 7 Exam