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-IS.
C.
Authentication is not properly configured for the adjacency.
D.
Both routers are configured as the DR, causing a conflict.