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350-501 Automation and Quality of Services Practice Question

An SP engineer is designing a QoS policy for a customer with three traffic classes: voice (priority), premium data (bandwidth guarantee), and best effort. The total bandwidth is 10 Mbps, with voice limited to 1 Mbps, premium data to 4 Mbps, and best effort to the remaining. Which policy-map configuration correctly uses LLQ and CBWFQ?

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

✓

policy-map QOS class VOICE priority 1000 class PREMIUM bandwidth 4000 class class-default fair-queue

LLQ is used for voice (priority), CBWFQ for premium data (bandwidth), and default class for best effort.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    policy-map QOS class VOICE priority percent 10 class PREMIUM bandwidth percent 40 class class-default shape average 5000

    Why it's wrong here

    Using shape in the default class is not typical; also percent values are okay but the question specifies values in kbps.

  • ✗

    policy-map QOS class VOICE bandwidth 1000 class PREMIUM priority 4000 class class-default fair-queue

    Why it's wrong here

    Priority should be on voice, not premium data.

  • ✗

    policy-map QOS class VOICE priority 1000 class PREMIUM priority 4000 class class-default fair-queue

    Why it's wrong here

    Two priority queues would cause conflicts; only one priority queue is allowed.

  • ✓

    policy-map QOS class VOICE priority 1000 class PREMIUM bandwidth 4000 class class-default fair-queue

    Why this is correct

    Correct: voice uses priority, premium uses bandwidth, default uses fair-queue.

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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.