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The Backup DIS is called?

To eliminate the need for adjacent routers on broadcast networks to form n(n-1)/2 adjacencies, IS-IS defines a pseudonode or Designated Intermediate System, DIS. All routers on the broadcast medium form an adjacency with the DIS. The Backup DIS is called…?

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A.
Redundant DIS

B.
BDR

C.
There is no concept of a backup DIS in IS-IS

D.
Designated Redundant System

Explanation:
There is no concept of a backup DIS in IS-IS.


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