300-420 ENSLD Practice Questions: Multi-Campus Layer 3 Design

Multi-Campus Layer 3 Design: Summarization, Filtering, VRFs, Topology, and Redistribution

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A multi-campus enterprise uses OSPF across three campuses. Each campus has two distribution switches connected to a common core. During an access-layer failure in Campus A, route changes are repeatedly propagated into the core and cause SPF recalculations in all campuses. What is the best design action to reduce the blast radius while preserving reachability?

Select one option.

Place all campus and core links in a single flat OSPF area so every router has the same topology view
Redistribute OSPF into BGP at every distribution switch to isolate failures
Disable summarization so all downstream access prefixes remain visible to the core
Use area boundaries or aggregation points at the campus distribution layer and summarize campus routes toward the core
Increase OSPF hello and dead timers across the entire enterprise

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