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400-007 · Question #141
400-007 Question #141: Real Exam Question with Answer & Explanation
The correct answer is B: It can create microloops during reconvergence. Policy-based routing operates independently of the routing protocol, so during reconvergence the mismatch between PBR decisions and the updating routing table can create temporary forwarding loops called microloops.
Question
Company XYZ has implemented policy-based routing in their network. Which potential problem must be kept in mind about network reconvergence and PBR?
Options
- AIt can limit network scalability
- BIt can create microloops during reconvergence
- CIt increases convergence time.
- DIt reduces convergence time.
Explanation
Policy-based routing operates independently of the routing protocol, so during reconvergence the mismatch between PBR decisions and the updating routing table can create temporary forwarding loops called microloops.
Common mistakes.
- A. PBR does not inherently limit network scalability; it adds configuration complexity but does not constrain the number of routes or devices the network can support.
- C. PBR does not increase convergence time because convergence is driven entirely by the routing protocol (e.g., OSPF, EIGRP), not by PBR policies.
- D. PBR has no interaction with the routing protocol convergence mechanism and therefore cannot reduce convergence time.
Concept tested. PBR microloops during network reconvergence
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