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352-001 · Question #593
352-001 Question #593: Real Exam Question with Answer & Explanation
The correct answer is B: It can create microloops during network reconvergence. A key design concern for policy-based routing is that it can create microloops during reconvergence because PBR overrides routing table decisions independently on each router.
Question
What is design considerations of policy-based routing?
Options
- AIt decreases failure detection time
- BIt can create microloops during network reconvergence
- CIt routes traffic destined to a set of users through different exit points
- DIt uses RSVP to differentiate traffic flows, so queuing mechanisms can prioritize them
Explanation
A key design concern for policy-based routing is that it can create microloops during reconvergence because PBR overrides routing table decisions independently on each router.
Common mistakes.
- A. PBR is a forwarding policy mechanism and plays no role in failure detection - it does not interact with BFD, hello timers, or any other detection protocol to decrease detection time.
- C. Routing traffic through different exit points based on user groups describes the intended purpose and operational capability of PBR, not a design risk or consideration.
- D. PBR uses route maps and extended ACLs to match and redirect traffic - it does not use RSVP, which is a signaling protocol for traffic engineering and bandwidth reservation.
Concept tested. Policy-based routing microloop risk during reconvergence
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