Cisco CCNA mock exam questions sample test – Question 217

.On which of the following networks will OSPF elect a designated router (DR)? (Choose two.)

A. Broadcast
B. NBMA
C. Point-to-point
D. Point-to-multipoint

Correct Answer: AB

Explanation:
OSPF will perform an election for a designated router (DR) and backup designated router (BDR) on every multi-access network segment. Multi-access segments are defined as
segments where more than two hosts can reach each other directly, such as a shared Ethernet segment (broadcast multi-access) or Frame Relay (non-broadcast multi-access, or
NBMA).
DR and BDR elections do not occur on point-to-point or point-to-multipoint segments. Point-to-point and point-to-multipoint segments are not considered multi-access segments.
OSPF routers on these network types will establish an adjacency without a DR/BDR election.
Objective:
Routing Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot single area and multi-area OSPFv2 for IPv4 (excluding authentication, filtering, manual summarization, redistribution, stub, virtual-link, and LSAs)
References:
Cisco > Support > IP > IP Routing > Technology Information > Technology White Paper > OSPF Design Guide > Document ID: 7039 > DR Election