350-501 Automation and Quality of Services Practice Question
An SP network experiences congestion on a core link. The QoS policy uses CBWFQ with classes for voice (LLQ), video (bandwidth 30%), and data (bandwidth 50%). During congestion, voice traffic spikes to 25% of the link. What happens to video and data 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
✓
Video and data share the remaining 75% as per their bandwidth percentages
LLQ is strict priority, so voice gets priority up to its police rate; if voice exceeds, it may be dropped. Video and data get their allocated bandwidths, but if voice exceeds its allowed priority, it may be policed, preventing starvation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Video and data are dropped entirely until voice subsides
Why it's wrong here
Incorrect; they still get their allocated bandwidth.
- ✗
Video and data are unaffected
Why it's wrong here
Incorrect; they get less bandwidth if voice exceeds.
- ✗
Video and data are treated as best effort
Why it's wrong here
Incorrect; they have guaranteed bandwidth.
- ✓
Video and data share the remaining 75% as per their bandwidth percentages
Why this is correct
Correct; after voice priority, remaining bandwidth is allocated proportionally.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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