What is the default OSPF Hello timer on Ethernet connections?

The default OSPF Hello timer on Ethernet connections is indeed 10 seconds. This timer is crucial in the OSPF (Open Shortest Path First) protocol as it determines how often OSPF routers send Hello packets to establish and maintain neighbor relationships. These Hello packets are sent to identify neighboring routers, ensuring that they are reachable and healthy.

In the context of OSPF, having a 10-second interval allows for a balance between timely updates and network resource efficiency. If the Hello packets are sent too frequently, it could lead to unnecessary traffic and CPU load on the routers; if sent too infrequently, it could delay fault detection and neighbor discovery. Thus, the 10-second default timer is designed to provide a responsive yet efficient operation in most Ethernet environments, helping to maintain robust and stable OSPF neighbor adjacencies.