Cisco Certified Network Associate (CCNA) Practice Exam

In Frame Relay networks with OSPF, what must be configured to establish static neighbor relationships?

1. Static Routes

2. Dynamic Routing Protocols

3. Static Neighbors

4. Frame Relay Switches

The correct answer is: Static Neighbors

In Frame Relay networks using OSPF, establishing static neighbor relationships requires the configuration of static neighbors. This is because OSPF traditionally relies on dynamic discovery of neighbors through the exchange of Hello packets. However, in scenarios where you cannot rely on dynamic neighbor discovery—such as in Frame Relay configurations where subnets can be segmented or where you have point-to-point links—it's necessary to specify the neighbors statically. By configuring static neighbors, you manually define which routers will form OSPF adjacencies, allowing for OSPF routing to function effectively in the environment. This method ensures that OSPF can discover and maintain routes despite the limitations imposed by the Frame Relay topology. In this context, other options are less relevant. Static routes do not directly influence OSPF neighbor relationships but rather dictate the path traffic takes. Dynamic routing protocols imply a mechanism where routes are learned and adjusted automatically, which is contrary to the requirement for static configurations. Frame Relay switches play a role in the switching of frames but do not affect neighbor relationships specifically.