350-501 Services Practice Question
Exhibit
Refer to the exhibit. ! On PE router ip access-list extended MATCH_VOIP permit udp any any range 16384 32767 ! class-map match-all VOIP match access-group name MATCH_VOIP ! policy-map QOS_PE class VOIP priority percent 30 class class-default fair-queue ! interface GigabitEthernet0/0/0 service-policy output QOS_PE !
Refer to the exhibit. A network engineer applies this policy on the PE-CE link. What is the expected behavior for VoIP traffic matching the access list?
⚠ Common exam trap
Cisco often tests the distinction between policing and shaping in LLQ configurations, where candidates mistakenly think 'police' implies shaping or that priority queuing drops all traffic during congestion.
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
✓
VoIP traffic is given strict priority queuing with up to 30% bandwidth
The policy-map applies the 'priority' command to the VoIP class, which enables strict priority queuing (LLQ). The 'police cir percent 30' command limits the priority queue's bandwidth to 30% during congestion, ensuring VoIP traffic is always served first but cannot exceed the configured percentage. This matches option A exactly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VoIP traffic is given strict priority queuing with up to 30% bandwidth
Why this is correct
Priority queue guarantees bandwidth up to 30% with strict priority.
- ✗
VoIP traffic is dropped if congestion occurs
Why it's wrong here
Priority queue can still drop if exceeding bandwidth, but not automatic drop.
- ✗
VoIP traffic is shaped to 30% of bandwidth
Why it's wrong here
Priority does not shape; it provides strict priority queuing.
- ✗
VoIP traffic is queued in the default class with fair-queue
Why it's wrong here
Classification matches VOIP class, not default.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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