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With which network type will OSPF establish router adjacencies but not perform the DR/BDR election process?

Question: With which network type will OSPF establish router adjacencies but not perform the DR/BDR election process?
[A].

Point-to-point

[B].

Backbone area 0

[C].

Broadcast multi-access

[D].

Non-broadcast multi-access

Answer: Option A

Explanation:

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.