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Question 630
During backup windows, video packets wait behind bulk data despite a design requiring low latency. Physical errors are absent. What should be reviewed?
- QoS scheduling policy mismatch
- Incorrect DSCP classification
- Physical FCS error condition
- Path routing asymmetry
Explanation
Correct Answer
A:QoS queue assignment and scheduler policy under load. The configured queue scheduler may not protect delay-sensitive traffic under contention.
Incorrect Answers
B:Misclassified ingress traffic can enter the wrong priority queue even when transport bandwidth is sufficient. But this does not address the case requirement to identify queue priority implementation.
C:Damaged copper or optics introduce corrupted frames and retransmission independent of application QoS. But this does not address the case requirement to identify queue priority implementation.
D:A return route or path change can cause variable performance not explained by local queue utilization. But this does not address the case requirement to identify queue priority implementation.
Question 631
A voice handset marks EF on its frame, but packet captures after the access switch show default DSCP. What is likely happening?
- Wrong DSCP-to-queue map
- Strict-priority queue starvation
- Policer threshold exceeded
- Untrusted ingress DSCP rewrite
Explanation
Correct Answer
D:The port is configured not to trust endpoint marking and rewrites it. An edge trust boundary can overwrite endpoint markings and place traffic in a lower service class.
Incorrect Answers
A:The device may retain an IP DSCP value but map it into an unintended local output queue. But this does not address the case requirement to identify ingress reclassification of DSCP.
B:An unbounded high-priority class may monopolize scheduling and delay lower-priority traffic. But this does not address the case requirement to identify ingress reclassification of DSCP.
C:A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate. But this does not address the case requirement to identify ingress reclassification of DSCP.
Question 632
Captures prove EF survives transit, yet voice lands in queue zero on one switch. Which error is most likely?
- Untrusted ingress DSCP rewrite
- Unsupported endpoint QoS configuration
- Wrong DSCP-to-queue map
- Policer threshold exceeded
Explanation
Correct Answer
C:The switch uses an unexpected DSCP-to-local-queue mapping. The device may retain an IP DSCP value but map it into an unintended local output queue.
Incorrect Answers
A:An edge trust boundary can overwrite endpoint markings and place traffic in a lower service class. But this does not address the case requirement to identify incorrect queue mapping without changed IP mark.
B:Client or handset software may use a different service class or fail to tag traffic as intended. But this does not address the case requirement to identify incorrect queue mapping without changed IP mark.
D:A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate. But this does not address the case requirement to identify incorrect queue mapping without changed IP mark.
Question 633
Bulk transfers are smooth until 100Mbps, then the interface reports an exact sustained drop rate with low physical errors. Which control may be enforcing the cap?
- Unsupported endpoint QoS configuration
- Wrong DSCP-to-queue map
- Policer threshold exceeded
- Strict-priority queue starvation
Explanation
Correct Answer
C:A rate policer can intentionally drop traffic past its configured threshold. A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate.
Incorrect Answers
A:Client or handset software may use a different service class or fail to tag traffic as intended. But this does not address the case requirement to identify policing rather than a cable fault.
B:The device may retain an IP DSCP value but map it into an unintended local output queue. But this does not address the case requirement to identify policing rather than a cable fault.
D:An unbounded high-priority class may monopolize scheduling and delay lower-priority traffic. But this does not address the case requirement to identify policing rather than a cable fault.
Question 634
Under a constant flood of priority video, lower classes cease making progress although the link remains healthy. Which configuration risk is present?
- Untrusted ingress DSCP rewrite
- Strict-priority queue starvation
- Policer threshold exceeded
- Missing application marking
Explanation
Correct Answer
B:Strict-priority traffic can starve other queues when no effective guardrail exists. An unbounded high-priority class may monopolize scheduling and delay lower-priority traffic.
Incorrect Answers
A:An edge trust boundary can overwrite endpoint markings and place traffic in a lower service class. But this does not address the case requirement to identify scheduler starvation.
C:A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate. But this does not address the case requirement to identify scheduler starvation.
D:A source that emits default DSCP will not automatically receive a designated real-time class. But this does not address the case requirement to identify scheduler starvation.
Question 635
A softphone sends only best-effort packets despite correctly configured switches. Where should the marking discrepancy be fixed?
- Missing application marking
- Policer threshold exceeded
- Strict-priority queue starvation
- Unsupported endpoint QoS configuration
Explanation
Correct Answer
A:Application-side DSCP generation is absent. A source that emits default DSCP will not automatically receive a designated real-time class.
Incorrect Answers
B:A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate. But this does not address the case requirement to identify source marking rather than network remarking.
C:An unbounded high-priority class may monopolize scheduling and delay lower-priority traffic. But this does not address the case requirement to identify source marking rather than network remarking.
D:Client or handset software may use a different service class or fail to tag traffic as intended. But this does not address the case requirement to identify source marking rather than network remarking.
Question 636
Only a newly updated phone model now applies a nonstandard DSCP to signaling traffic. Switch class maps have not changed. What is the probable cause?
- Policer threshold exceeded
- Unsupported endpoint QoS configuration
- Wrong DSCP-to-queue map
- Untrusted ingress DSCP rewrite
Explanation
Correct Answer
B:The endpoint software uses an inconsistent QoS marking profile. Client or handset software may use a different service class or fail to tag traffic as intended.
Incorrect Answers
A:A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate. But this does not address the case requirement to trace change to handset or application configuration.
C:The device may retain an IP DSCP value but map it into an unintended local output queue. But this does not address the case requirement to trace change to handset or application configuration.
D:An edge trust boundary can overwrite endpoint markings and place traffic in a lower service class. But this does not address the case requirement to trace change to handset or application configuration.
Question 637
AOS-CX shows expected packet DSCP but priority drops appear in a low-queue counter. Which mapping should be inspected?
- Missing application marking
- Unsupported endpoint QoS configuration
- Wrong DSCP-to-queue map
- Policer threshold exceeded
Explanation
Correct Answer
C:The DSCP-to-queue map chooses the local egress class. The device may retain an IP DSCP value but map it into an unintended local output queue.
Incorrect Answers
A:A source that emits default DSCP will not automatically receive a designated real-time class. But this does not address the case requirement to diagnose queue-map policy.
B:Client or handset software may use a different service class or fail to tag traffic as intended. But this does not address the case requirement to diagnose queue-map policy.
D:A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate. But this does not address the case requirement to diagnose queue-map policy.
Question 638
A traffic profile hits an exact configured peak and starts incrementing policer drop statistics. Which performance mechanism is directly responsible?
- Policer threshold exceeded
- Missing application marking
- Untrusted ingress DSCP rewrite
- Unsupported endpoint QoS configuration
Explanation
Correct Answer
A:Ingress or egress policing limits this class to its authorized rate. A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate.
Incorrect Answers
B:A source that emits default DSCP will not automatically receive a designated real-time class. But this does not address the case requirement to identify threshold-based policing.
C:An edge trust boundary can overwrite endpoint markings and place traffic in a lower service class. But this does not address the case requirement to identify threshold-based policing.
D:Client or handset software may use a different service class or fail to tag traffic as intended. But this does not address the case requirement to identify threshold-based policing.
Question 639
Network telemetry shows priority class fully served while ordinary traffic latency grows without packet errors. Which scheduling issue is credible?
- Policer threshold exceeded
- Missing application marking
- Strict-priority queue starvation
- Untrusted ingress DSCP rewrite
Explanation
Correct Answer
C:Unbounded strict priority service can prevent lower-priority progress. An unbounded high-priority class may monopolize scheduling and delay lower-priority traffic.
Incorrect Answers
A:A configured rate policer can discard or remark otherwise valid packets once traffic exceeds its committed rate. But this does not address the case requirement to diagnose priority starvation.
B:A source that emits default DSCP will not automatically receive a designated real-time class. But this does not address the case requirement to diagnose priority starvation.
D:An edge trust boundary can overwrite endpoint markings and place traffic in a lower service class. But this does not address the case requirement to diagnose priority starvation.
Question 640
An access port remains up while FCS errors grow by thousands per minute and file transfers retry. Which evidence points to the cause?
- Unsupported transceiver mode
- Late collisions or duplex mismatch
- Increasing CRC or FCS errors
- Optical receive power too low
Explanation
Correct Answer
C:CRC/FCS corruption indicates frame-level integrity loss. Corrupt frame counters reveal a physical or signal integrity problem even if carrier stays up.
Incorrect Answers
A:A module operating outside the supported platform/media/speed combination can destabilize a physical channel. But this does not address the case requirement to identify signal or media errors.
B:Incompatible duplex settings on legacy Ethernet can produce collisions and unusable throughput. But this does not address the case requirement to identify signal or media errors.
D:Receiver light below specification indicates excessive attenuation, damaged fiber or incompatible optics. But this does not address the case requirement to identify signal or media errors.
HPE Network Switching Professional (HPE7-A08) Practice Tests
