Question

OSPF networks where DR & BDR elections are NOT performed (5). Note: "neighbor" command required to establish adjacencies

A) Point-to-Point, Broadcast, Non-Broadcast Multi-Access (NBMA), Point-to-Multipoint, Point-to-Multipoint Non-Broadcast
B) Broadcast, Non-Broadcast Multi-Access (NBMA), Point-to-Multipoint, Point-to-Multipoint Non-Broadcast, Mesh
C) Point-to-Point, Broadcast, Point-to-Multipoint, Point-to-Multipoint Non-Broadcast, Mesh
D) Point-to-Point, Broadcast, Non-Broadcast Multi-Access (NBMA), Mesh, Hybrid

Answer 1

In OSPF networks, DR and BDR elections are not performed in certain network types such as Point-to-Point, Broadcast, Non-Broadcast Multi-Access (NBMA), Point-to-Multipoint, and Point-to-Multipoint Non-Broadcast.

Step-by-step explanation:

In OSPF networks, DR (Designated Router) and BDR (Backup Designated Router) elections are not performed in Point-to-Point, Broadcast, Non-Broadcast Multi-Access (NBMA), Point-to-Multipoint, and Point-to-Multipoint Non-Broadcast network types. These network types do not require the use of a DR and BDR because they only have two routers directly connected to each other or do not have a shared broadcast medium. For example, in a point-to-point network, there are only two routers directly connected to each other, so there is no need for a DR and BDR election. In a point-to-multipoint network, there may be multiple routers connected, but they do not share a broadcast medium. Each router establishes individual adjacencies with other routers, eliminating the need for a DR and BDR. In a non-broadcast multi-access (NBMA) network, a DR and BDR election is not performed because this network type does not support multicast, which is required for DR and BDR communications.