EIGRP and OSPF - Technical MCQs

Q1:

Which type of OSPF network will elect a backup designated router?
  1. Broadcast multi-access
  2. Non-broadcast multi-access
  3. Point-to-point
  4. Broadcast multipoint

A 1 and 2

B 3 and 4

C 3 only

D None of the above

ANS:A - 1 and 2

DR and BDR are elected on broadcast and non-broadcast multi-access networks. Frame Relay is a non-broadcast multi-access (NBMA) network by default. No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology.