300-415 Question #331: Real Exam Question with Answer & Explanation

The correct answer is A: MPLS. Given typical SLA configurations prioritizing lower latency and loss, traffic will choose the MPLS TLOC due to its superior latency and loss metrics.

Policies

Question

Refer to the exhibit. A WAN Edge router is configured with SLAs. Which TLOC does the traffic take if the internet TLOC has latency 100 ms, loss 2%, jitter 50ms, and the MPLS TLOC has latency 50 ms, loss 1%, and jitter 150 ms?

Options

AMPLS
Binternet
CMPLS or internet
Ddrop

Explanation

Given typical SLA configurations prioritizing lower latency and loss, traffic will choose the MPLS TLOC due to its superior latency and loss metrics.

Common mistakes.

B. The internet TLOC has higher latency and higher loss, making it less desirable than MPLS under standard SLA configurations that typically prioritize these metrics.
C. Without specific SLA thresholds and priorities, it's impossible for either to be chosen; however, given the metrics, one path is clearly superior in latency and loss.
D. Traffic would not be dropped unless both TLOCs failed to meet minimum SLA requirements or were otherwise unavailable.

Concept tested. Cisco SD-WAN SLA path selection

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-17-book/sdwan-policy-config.html

Topics

#SD-WAN SLA#Path selection#TLOC#Performance metrics

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