As stated in the Day 12 module, OSPF elects a Designated Router (DR) and/or a Backup Designated Router (BDR) on Broadcast and Non-Broadcast network types. It is important to understand that the BDR is not a mandatory component on these network types. In fact, OSPF will work just as well when only a DR is elected and there is no BDR; however, there will be no redundancy if the DR fails and the OSPF routers need to go through the election process again to elect a new DR.
On the segment (on Broadcast and Non-Broadcast network types . . .
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