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300-415 · Question #366
300-415 Question #366: Real Exam Question with Answer & Explanation
The correct answer is B: Policy configuration starting with 'policy sla-class VOICE_TRAFFIC latency 50 loss 5' and specifying `preferred-color mpls` with `backup-sla-preferred-color biz-internet`.. This question asks to identify the best control policy configuration for voice traffic, prioritizing MPLS with a backup, to ensure reliability and avoid blackholing.
Policies
Question
A customer requires reliability for voice traffic and has MPLS, biz-Internet, and public-Internet transports. Which control policy configuration maintains a better SLA and avoids blackholing of voice traffic?
Options
- APolicy configuration starting with 'policy sla-class VOICE_TRAFFIC latency 0' and specifying
preferred-color mpls. - BPolicy configuration starting with 'policy sla-class VOICE_TRAFFIC latency 50 loss 5' and specifying
preferred-color mplswithbackup-sla-preferred-color biz-internet. - CPolicy configuration starting with 'policy sla-class VOICE_TRAFFIC latency 150 loss 5' and specifying
preferred-color mplswithbackup-sla-preferred-color biz-internet. - DPolicy configuration starting with 'policy sla-class VOICE_TRAFFIC latency 150 loss 5' and specifying
preferred-color mpls(no backup color shown).
Explanation
This question asks to identify the best control policy configuration for voice traffic, prioritizing MPLS with a backup, to ensure reliability and avoid blackholing.
Common mistakes.
- A. A latency of
0is an unrealistic and unachievable SLA requirement, making this policy ineffective or constantly failing. It also lacks a backup SLA preferred color, risking blackholing. - C. A latency of
150ms is generally too high for real-time voice traffic, which typically requires much lower latency for good quality, making this SLA less suitable for voice. - D. A latency of
150ms is too high for voice traffic, similar to C. Additionally, it lacks abackup-sla-preferred-color, which is crucial for reliability and avoiding blackholing when the primary preferred color fails or degrades.
Concept tested. SLA class configuration for voice traffic with preferred and backup colors
Topics
#SD-WAN Policies#SLA Class#Voice QoS#Path Selection
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