350-501 Services Practice Question
Which technology allows a service provider to offer different classes of service over a single MPLS network?
⚠ Common exam trap
Cisco often tests the misconception that MPLS VPNs or VRFs alone provide class-of-service differentiation, when in fact VRFs only isolate routing and forwarding, and QoS policies must be separately configured to prioritize traffic within or across VPNs.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
QoS
QoS (Quality of Service) enables a service provider to differentiate traffic by marking packets with specific DSCP or IP precedence values and applying policies such as policing, shaping, and queuing. This allows multiple classes of service (e.g., voice, video, best-effort) to be carried over a single MPLS network while guaranteeing bandwidth, latency, and jitter requirements for each class.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
QoS
Why this is correct
QoS provides classification and prioritization for service classes.
- ✗
BGP
Why it's wrong here
BGP is used for routing information exchange.
- ✗
LDP
Why it's wrong here
LDP distributes MPLS labels.
- ✗
MPLS VPN (VRF)
Why it's wrong here
VRFs separate routing, not traffic classes.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.