A company wants a design that would support OSPF through a service provider ATM network. Which two OSPF network types should the designer use to establish OSPF neighborship between OSPF routers throug

Broadcast network type does not always work through ATM because ATM is inherently NBMA and does not support broadcast unless explicitly configured with broadcast-capable PVC or SVC maps.

ATM does not natively support broadcast, but when the ATM network is explicitly configured to support broadcast via broadcast-enabled PVC or SVC maps, OSPF can use the broadcast network type and elect a DR/BDR as it would on Ethernet.

When OSPF is configured as a nonbroadcast (NBMA) network type over ATM, the protocol cannot dynamically discover neighbors because ATM does not forward multicast or broadcast hellos; therefore, each neighbor must be explicitly configured with the 'neighbor' command under the OSPF process.

OSPF point-to-multipoint network type uses unicast hello packets directed to each neighbor and does not require explicit neighbor statements.

Nonbroadcast (NBMA) network type does require DR/BDR election just like broadcast networks; it is the point-to-multipoint network type that skips DR/BDR selection.