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EIGRP and OSPF - Technical MCQs

Q1:

Which of the following network types have a designated router and a backup designated router assigned?
  1. Broadcast
  2. Point-to-point
  3. NBMA
  4. NBMA point-to-point

A 1, 2 and 3

B 1 and 3

C 3 and 4

D All of the above

ANS:B - 1 and 3

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. 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.