This 350-501 practice question tests your understanding of services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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
!
A
VoIP traffic is given strict priority queuing with up to 30% bandwidth
Priority queue guarantees bandwidth up to 30% with strict priority.
B
VoIP traffic is dropped if congestion occurs
Why wrong: Priority queue can still drop if exceeding bandwidth, but not automatic drop.
C
VoIP traffic is shaped to 30% of bandwidth
Why wrong: Priority does not shape; it provides strict priority queuing.
D
VoIP traffic is queued in the default class with fair-queue
Why wrong: Classification matches VOIP class, not default.
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
Option B is correct because priority queue provides strict priority; traffic is not shaped. Option A is wrong because priority does not shape. Option C is wrong because fair-queue is for default class. Option D is wrong because congestion is avoided but not specifically by WRED.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Related concept
Standard ACLs match source addresses.
✗
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.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-501 ACL questions on filtering logic and placement.
Services — This question tests Services — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: VoIP traffic is given strict priority queuing with up to 30% bandwidth — Option B is correct because priority queue provides strict priority; traffic is not shaped. Option A is wrong because priority does not shape. Option C is wrong because fair-queue is for default class. Option D is wrong because congestion is avoided but not specifically by WRED.
What should I do if I get this 350-501 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-501 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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