Cisco Certified Network Associate (CCNA) Practice Exam

What is the purpose of the command to configure the default-gateway in OSPFv3?

1. To enable OSPF routing protocol

2. To define the router ID

3. To propagate the default route

4. To verify interface connectivity

The correct answer is: To propagate the default route

The command to configure the default-gateway in OSPFv3 plays a crucial role in managing routing for a network by enabling the propagation of a default route. When a default route is configured and redistributed into OSPF, it allows routers within the OSPF area to forward packets destined for unknown networks to a specific next-hop address, ensuring that there is a clear path for handling traffic that does not have a specific route defined. In the context of OSPFv3, which is the version of OSPF used for IPv6, the default-gateway command can be essential for maintaining network efficiency by directing traffic appropriately when no specific route matches a destination. This capability ensures seamless connectivity within the network as well as between different networks, thereby enhancing overall routing performance. Understanding how the default route functions in OSPFv3 is vital for network administrators, as it helps them design networks that are resilient and capable of managing various traffic conditions without disruption. The ability to propagate a default route is particularly important in larger networks, where multiple subnets are used, and not every router needs a comprehensive understanding of every route in the network.