Cisco Certified Network Associate (CCNA) Practice Exam

What command is used to advertise a default route via OSPF?

1. default-route originate

2. default-information originate

3. ipv6 default-route

4. default route ospf

The correct answer is: default-information originate

To advertise a default route in OSPF (Open Shortest Path First), the command utilized is "default-information originate." This command enables a router to inject a default route (usually represented as 0.0.0.0/0) into the OSPF routing domain. When this command is configured, the router will announce the default route to all OSPF neighbors, allowing other routers to utilize the default route for forwarding packets that do not have a specific route in the routing table. The command "default-information originate" is particularly useful in scenarios where a router is connected to a wider internet or external network and serves as the entry point for routing configurations. It helps in efficient traffic management by guiding packets towards the appropriate exit points in a network hierarchy. Understanding the significance of this command also comes with recognizing how OSPF operates in a hierarchical manner and uses areas to structure routing information. By injecting a default route, it simplifies routing decisions within an OSPF area by providing a means for traffic destined for unknown networks to be routed appropriately. The other choices do not represent valid OSPF commands for advertising a default route. Thus, "default-information originate" stands out as the correct terminology and functionality in the context of OSP