350-501 Architecture Practice Question
An engineer is configuring QoS on a service provider edge router to prioritize real-time traffic. Which queuing mechanism provides the lowest latency and jitter for voice traffic?
⚠ Common exam trap
Cisco often tests the distinction between queuing mechanisms and congestion avoidance, so candidates may mistakenly choose WRED (a drop mechanism) or CBWFQ (which lacks strict priority) instead of LLQ for real-time traffic.
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
✓
LLQ
LLQ (Low Latency Queuing) is the correct choice because it combines a strict priority queue with CBWFQ, ensuring that voice traffic is always served before any other queue. This strict priority scheduling minimizes both latency and jitter for real-time traffic, which is critical for voice quality.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
FIFO
Why it's wrong here
FIFO does not prioritize traffic.
- ✗
CBWFQ
Why it's wrong here
CBWFQ provides bandwidth guarantees but no strict priority.
- ✗
WRED
Why it's wrong here
WRED is a congestion avoidance mechanism, not a queuing mechanism.
- ✓
LLQ
Why this is correct
LLQ combines strict priority queue with CBWFQ for real-time traffic.
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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.