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

In IS-IS networks, which routers does the backup designated router (BDR) form adjacencies to?
A . Only to the D
C . The BDR only becomes adjacent when the DR is down.
D . To all routers.
E . There is no BDR in IS-I

View Answer

Answer: D