What is the default OSPF hello interval for most network types?

The default OSPF hello interval for most network types, including broadcast and point-to-point networks, is indeed 10 seconds. The hello interval is a crucial parameter in OSPF (Open Shortest Path First) because it dictates how often OSPF routers send hello packets to discover and maintain neighbor relationships.

These hello packets are necessary for establishing and maintaining the adjacencies between OSPF routers. By default, if routers do not receive a hello packet from a neighbor within a specific time frame (which depends on the dead interval), they will consider that neighbor to be down and will initiate the process of re-calculating the routing table.

Setting the hello interval to 10 seconds strikes a balance between responsiveness and bandwidth consumption. If the interval were set too low, it could lead to unnecessary overhead on the network due to the frequent transmission of these packets, while a higher interval could delay neighbor discovery and result in slower convergence times. Understanding the default hello interval is essential when configuring or troubleshooting OSPF in diverse network environments.