Click the Exhibit button.
R1 and R2 are directly connected using the interfaces shown in the exhibit.R1 can ping R2’s interface, and R2 can ping R1’s interface. The IS-IS adjacency will not come up.
What is causing the adjacency to fail?
A . The correct levels are not configured under protocols isis.
B . The link MTU is too small to support IS-I
D . Authentication is not properly configured for the adjacency.
E . Both routers are configured as the DR, causing a conflict.
Answer: B