The four routers run IS-S and have established an adjacency relationship. The area numbers and router levels are marked in the figure. What is the cost of R4 reaching 10.0.2.2/32?

 The four routers run IS-S and have established an adjacency relationship. The area numbers and router levels are marked in the figure. What is the cost of R4 reaching 10.0.2.2/32?

A . 40
B. 10
C. 20
D. 30

Answer: D

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