The default network type in an OSPF network is set by the physical media used. It can be overridden in interface configuration mode with the command ip ospf network
| Type | Description | DR/BDR field used | Timers |
| Broadcast | Default in Ethernet networks | Yes | Hello: 10 Wait: 40 Dead: 40 |
| Non-broadcast | Used in Frame Relay main or multipoint subinterfaces | Yes | Hello: 30 Wait: 120 Dead: 120 |
| Point-to-point | Used in Frame Relay point to point sub-interfaces | No | Hello: 10 Wait: 40 Dead: 40 |
| Point-to-multipoint | Not used by default. Used for hub and spoke topologies | No | Hello: 30 Wait: 120 Dead: 120 |
| Loopback | Default setting used on Loopback interfaces. Only advertises the host route /32 | No | None |
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