Final answer:
The default hello timer in OSPF depends on the network type. For OSPF Broadcast networks, the default hello timer is 10 seconds.
Step-by-step explanation:
In OSPF, the Hello Timer is used to determine the interval at which OSPF routers send hello packets to their neighbors. Hello packets are used to establish and maintain OSPF neighbor relationships. The default hello timer depends on the network type:
- Broadcast network: The default hello timer is 10 seconds.
- Point-to-Point (P2P) network: The default hello timer is 60 seconds.
So, for OSPF Broadcast networks, the default hello timer is 10 seconds (Option B).