Which two OSPF network type require the use of a DR and BDR? (Choose two)

In non-broadcast multi-access (NBMA) networks, a DR/BDR is required to establish full adjacencies and control LSA flooding, similar to broadcast networks but often requiring static neighbor configuration.

Point-to-point networks only involve two routers, so there is no need for a DR/BDR election to manage adjacencies.

Point-to-point non-broadcast networks are still point-to-point in nature, thus not requiring a DR/BDR.

In broadcast multi-access networks (like Ethernet), a DR and BDR are elected to reduce the number of adjacencies and to act as a central point for LSA exchange, preventing a full mesh of adjacencies.

Point-to-multipoint networks (which can be configured on NBMA interfaces) treat each connection as a point-to-point link, and therefore do not elect a DR/BDR.