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352-001 · Question #446
352-001 Question #446: Real Exam Question with Answer & Explanation
The correct answer is B: Set the interface bandwidth to match the access rate.. EIGRP uses the configured interface bandwidth to calculate routing metrics and govern update rates, so the bandwidth must match the actual WAN access rate to avoid incorrect metrics and potential link saturation.
Question
You are designing a WAN network solution with EIGRP based on VPLS. The interface speed is 10 Mb/s, but the access rate of the WAN connection is 256 Kb/s. What should you include in the network design, in order to avoid potential issues with EIGRP?
Options
- ATag outbound EIGRP traffic and have the WAN provider add it to the priority queue.
- BSet the interface bandwidth to match the access rate.
- CLimit traffic to the access rate with interface traffic shaping.
- DLimit EIGRP traffic to the access rate with a policer.
Explanation
EIGRP uses the configured interface bandwidth to calculate routing metrics and govern update rates, so the bandwidth must match the actual WAN access rate to avoid incorrect metrics and potential link saturation.
Common mistakes.
- A. Tagging and prioritizing EIGRP traffic with the WAN provider does not correct the underlying bandwidth mismatch that causes incorrect metric calculations.
- C. Traffic shaping limits the aggregate rate but does not fix EIGRP's metric calculation, which remains based on the incorrect 10 Mb/s interface bandwidth value.
- D. Policing EIGRP traffic drops routing packets when the rate is exceeded, which would destabilize neighbor adjacencies rather than resolving the root cause of the bandwidth mismatch.
Concept tested. EIGRP interface bandwidth configuration for accurate metric calculation
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