Refer to the exhibit.
Which two topology changes happen to the IS-IS routers? (Choose two.)
A . All four routers are operating as Level 1 routers only.
B . All four routers are operating as Level 2 routers only.
C . R1 and R4 are Level 2 neighbors.
D . R1 and R2 are Level 2 neighbors.
E . All four routers are operating as Level 1-2 routers.
Answer: D,E
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