OSPF Network Types

OSPF Network Type Name	Does it send Multicast or Unicast Updates?	Is it a Shared or Point-to-Point
NBMA i.e. Non-Broadcast Multi -Access	Unicast, so it needs neighbor configuration	Shared, so it requires a DR
Broadcast	Multicasts updates, so no neighbor configuration	Shared, so it requires a DR
Point-to-point	Multicasts updates, so no neighbor configuration	Point-to-point  Only two devices in a subnet (or a loopback interface)
Point-to-multipoint	Multicasts updates, so no neighbor configuration	Point-to-point  Permits more than two devices per subnet. Host routes generated for each router.
Point-to-multipoint non-broadcast	Unicast, so it needs neighbor configuration	Point-to-point  Permits more than two devices per subnet. Host routes generated for each router.

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