Refer to the exhibit. Two directly connected routers are unable to ping each other through the only active serial interfaces. What is the problem?

Refer to the exhibit. Two directly connected routers are unable to ping each other through the only active serial interfaces. What is the problem?

• The IP addressing scheme is incorrect.
• Loopbacks should be set on R1 and R2.
• PPP encapsulation needs to be configured on R1.
• The bandwidth settings must be the same on R1 and R2.
• A no shutdown command needs to be configured on both serial interfaces.

Exam with this question: CCNA Discovery 4: DCompNtwk Chapter 8 Exam