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The serial interfaces on R1 and R2 has been configured as shown in the exhibit. However, pings on each side are failing.
What is the most likely cause of this connectivity problem?

R1 needs to have clockrate set to 768

The Maximum Transmission Unit exceeds the maximum size on both routers

The serial interfaces on R1 and R2 are administratively down

the configured layer 2 encapsulation on both routers does not match

The IP addresses must reside on the 10.1.1.0/30 subnet

The bandwidth does not match

Explanation

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