In IS-IS networks, which routers does the backup designated router (BDR) form adjacencies to?

A. Only to the DR.
B. The BDR only becomes adjacent when the DR is down.
C. To all routers.
D. There is no BDR in IS-IS.
Correct Answer: D
Section: Routing
BDRs are used by OSFP and NOT IS-IS. IS-IS uses L1 and L2 routers
A backup designated router (BDR) is a router that becomes the designated router if the current designated router has a problem or fails. The BDR is the
OSPF router with second highest priority at the time of the last election.

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