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352-001 · Question #419
352-001 Question #419: Real Exam Question with Answer & Explanation
The correct answer is B: route filtering and administrative policies. When redistributing routes between OSPFv2 and IS-IS domains, route filtering and administrative policies prevent routing loops and suboptimal paths at redistribution boundaries.
Question
Which option should be part of your network design to support dynamic mutual redistribution between multiple OSPFv2 and IS-IS boundaries, to avoid suboptimal routing?
Options
- Aroute tagging and administrative policies
- Broute filtering and administrative policies
- Croute aggregation and administrative policies
- Ddisabling IS-IS wide metrics
Explanation
When redistributing routes between OSPFv2 and IS-IS domains, route filtering and administrative policies prevent routing loops and suboptimal paths at redistribution boundaries.
Common mistakes.
- A. Route tagging identifies the origin of a route but does not filter or restrict which routes are redistributed, leaving suboptimal routing unresolved.
- C. Route aggregation reduces routing table size but does not address suboptimal routing caused by mutual redistribution across protocol boundaries.
- D. Disabling IS-IS wide metrics removes extended metric support and reduces scalability, worsening rather than resolving suboptimal routing in large networks.
Concept tested. Route redistribution filtering between OSPFv2 and IS-IS
Reference. https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/13730-51.html
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