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Question 870
A campus switch has a traffic shaper that reduces video quality even though voice remains clear. What should the network engineer do to address this requirement?
- Review per-flow hashing and consider supported aggregation or application-level distribution
- Coordinate the provider's supported QoS class mapping and local ingress/egress policy
- Review minimum/basic rates with measured coverage and legacy client requirements
- Review class allocation and rate limits for video and voice separately
Explanation
Correct Answer
D:Application priorities and shaping limits need proportionate capacity. Per-class evidence identifies the overrestricted traffic class.
Incorrect Answers
A:A single flow may not spread across multiple equal-cost paths. By contrast, application priorities and shaping limits need proportionate capacity.
B:End-to-end prioritization depends on preserved or translated markings. In this situation, application priorities and shaping limits need proportionate capacity.
C:Slow management traffic consumes disproportionate airtime in dense cells. It would not resolve the documented symptom; application priorities and shaping limits need proportionate capacity.
Question 871
A campus switch has a traffic shaper that reduces video quality even though voice remains clear. What should the team inspect to confirm the result?
- Compare failing client capability against changed WLAN parameters and association logs
- Compare retries, noise floor and channel busy time for affected clients
- Compare channel utilization and client connection success before and after rate tuning
- Measure video bitrate, dropped frames and matched QoS class during the shaper interval
Explanation
Correct Answer
D:Per-class evidence identifies the overrestricted traffic class. Application priorities and shaping limits need proportionate capacity.
Incorrect Answers
A:The exact mismatch identifies what optimization broke compatibility. It would not resolve the documented symptom; per-class evidence identifies the overrestricted traffic class.
B:The measurements distinguish interference from insufficient capacity. By contrast, per-class evidence identifies the overrestricted traffic class.
C:Higher rates are useful only when edge devices still operate. The relevant technical distinction is that per-class evidence identifies the overrestricted traffic class.
Question 872
A campus switch has a traffic shaper that reduces video quality even though voice remains clear. Which misconception is most likely to obstruct a correct fix?
- Accept every client DSCP value as an approved enterprise priority
- Assume one TCP flow will saturate the sum of every ECMP uplink rate
- Assume a wider channel always improves total campus throughput regardless of density
- Remove all QoS classification so both applications compete without any prioritization
Explanation
Correct Answer
D:Eliminating controls may worsen low-latency traffic service. Application priorities and shaping limits need proportionate capacity.
Incorrect Answers
A:Untrusted endpoints can abuse premium queues. Here, however, eliminating controls may worsen low-latency traffic service.
B:Hash-based load balancing typically pins a flow to one path. The relevant technical distinction is that eliminating controls may worsen low-latency traffic service.
C:High overlap can cancel any per-link bandwidth advantage. By contrast, eliminating controls may worsen low-latency traffic service.
Question 873
A campus switch has a traffic shaper that reduces video quality even though voice remains clear. What precaution is most important before the change is expanded?
- Test with real warehouse movements before finalizing radio power
- Rebalance queues on a pilot interface and verify other application classes
- Provide a restricted compatible SSID or managed replacement plan
- Validate client capability and latency during a phased channel-plan change
Explanation
Correct Answer
B:Fixing one class should not starve another. Per-class evidence identifies the overrestricted traffic class.
Incorrect Answers
A:Operational activity changes the propagation environment. Here, however, fixing one class should not starve another.
C:Performance improvements should include a supported transition for older devices. In this situation, fixing one class should not starve another.
D:A new width can affect older devices and regulatory choices. The relevant technical distinction is that fixing one class should not starve another.
Question 874
A branch WAN uses DSCP for voice but the upstream provider rewrites markings unexpectedly. Which configuration decision most directly resolves the situation?
- Review class allocation and rate limits for video and voice separately
- Review per-flow hashing and consider supported aggregation or application-level distribution
- Coordinate the provider's supported QoS class mapping and local ingress/egress policy
- Define trust boundaries for DSCP markings and remark untrusted edge traffic
Explanation
Correct Answer
C:End-to-end prioritization depends on preserved or translated markings. The observed marking transition explains differing delay.
Incorrect Answers
A:Application priorities and shaping limits need proportionate capacity. Here, however, end-to-end prioritization depends on preserved or translated markings.
B:A single flow may not spread across multiple equal-cost paths. In this situation, end-to-end prioritization depends on preserved or translated markings.
D:User-provided priority tags must not override business policy. It would not resolve the documented symptom; end-to-end prioritization depends on preserved or translated markings.
Question 875
A branch WAN uses DSCP for voice but the upstream provider rewrites markings unexpectedly. Which check most directly demonstrates the desired network behavior?
- Measure SNR, retry rates and application latency along the equipment routes
- Measure interactive latency and backup throughput during representative simultaneous load
- Capture packets before and after the provider handoff and compare treatment
- Inspect client band choice, channel utilization and user throughput after a trial
Explanation
Correct Answer
C:The observed marking transition explains differing delay. End-to-end prioritization depends on preserved or translated markings.
Incorrect Answers
A:A moving RF survey captures the conditions that cause jitter. It would not resolve the documented symptom; the observed marking transition explains differing delay.
B:Both service classes should remain within business targets. By contrast, the observed marking transition explains differing delay.
D:Effective steering should improve actual service, not just association counts. In this situation, the observed marking transition explains differing delay.
Question 876
A branch WAN uses DSCP for voice but the upstream provider rewrites markings unexpectedly. Which assumption would be most misleading when investigating this situation?
- Remove all QoS classification so both applications compete without any prioritization
- Increase each AP's transmit power and expect the wired uplink capacity to grow
- Block all UDP traffic to reduce video usage without distinguishing real-time applications
- Assume a local DSCP tag guarantees identical handling in every carrier network
Explanation
Correct Answer
D:External providers apply their own QoS policies. End-to-end prioritization depends on preserved or translated markings.
Incorrect Answers
A:Eliminating controls may worsen low-latency traffic service. The relevant technical distinction is that external providers apply their own QoS policies.
B:Radio power cannot change the uplink's physical rate. By contrast, external providers apply their own QoS policies.
C:Many legitimate conferencing and voice flows use UDP. It would not resolve the documented symptom; external providers apply their own QoS policies.
Question 877
A branch WAN uses DSCP for voice but the upstream provider rewrites markings unexpectedly. Which safeguard best reduces the deployment risk in this case?
- Address interference first and then retest application latency
- Implement a tested shaping policy with emergency backup exceptions
- Pilot basic-rate changes with the oldest approved client group
- Record contracted QoS behavior and test failover through secondary carriers
Explanation
Correct Answer
D:Backup networks may not honor the same traffic classes. The observed marking transition explains differing delay.
Incorrect Answers
A:A bandwidth upgrade cannot fix the RF collision environment. Here, however, backup networks may not honor the same traffic classes.
B:Performance tuning should not prevent essential recovery jobs. The relevant technical distinction is that backup networks may not honor the same traffic classes.
C:Incompatible edge devices can lose service after aggressive tuning. By contrast, backup networks may not honor the same traffic classes.
Question 878
A busy wireless campus has clients on 2.4 GHz when 5 GHz offers cleaner capacity. What is the most appropriate first technical change?
- Review minimum/basic rates with measured coverage and legacy client requirements
- Evaluate supported band steering and cell design without excluding legacy clients
- Capacity-plan QoS classes for the surviving link and test degraded-path congestion
- Apply supported WMM and end-to-end QoS marking for voice while maintaining normal data policy
Explanation
Correct Answer
B:Moving compatible users can reduce 2.4 GHz contention. Effective steering should improve actual service, not just association counts.
Incorrect Answers
A:Slow management traffic consumes disproportionate airtime in dense cells. The relevant technical distinction is that moving compatible users can reduce 2.4 GHz contention.
C:Redundancy reduces available bandwidth during a failure. Here, however, moving compatible users can reduce 2.4 GHz contention.
D:Priority handling can reduce voice delay under contention. In this situation, moving compatible users can reduce 2.4 GHz contention.
Question 879
A busy wireless campus has clients on 2.4 GHz when 5 GHz offers cleaner capacity. Which observation would best verify that the intended behavior is working?
- Capture packets before and after the provider handoff and compare treatment
- Compare next-hop counters for many independent flows versus one transfer
- Measure SNR, retry rates and application latency along the equipment routes
- Inspect client band choice, channel utilization and user throughput after a trial
Explanation
Correct Answer
D:Effective steering should improve actual service, not just association counts. Moving compatible users can reduce 2.4 GHz contention.
Incorrect Answers
A:The observed marking transition explains differing delay. It would not resolve the documented symptom; effective steering should improve actual service, not just association counts.
B:The contrast demonstrates the distribution granularity. In this situation, effective steering should improve actual service, not just association counts.
C:A moving RF survey captures the conditions that cause jitter. Here, however, effective steering should improve actual service, not just association counts.
Question 880
A busy wireless campus has clients on 2.4 GHz when 5 GHz offers cleaner capacity. Which belief about the configuration should the team reject?
- Assume nominal aggregate dual-link bandwidth remains unchanged after one link fails
- Block all UDP traffic to reduce video usage without distinguishing real-time applications
- Disable 2.4 GHz immediately for all devices without checking scanner support
- Assume a low five-minute average utilization guarantees zero short-term queue loss
Explanation
Correct Answer
C:Single-band legacy devices may lose connectivity. Moving compatible users can reduce 2.4 GHz contention.
Incorrect Answers
A:Losing a physical link reduces available capacity. In this situation, single-band legacy devices may lose connectivity.
B:Many legitimate conferencing and voice flows use UDP. By contrast, single-band legacy devices may lose connectivity.
D:Averages can hide momentary saturation. It would not resolve the documented symptom; single-band legacy devices may lose connectivity.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests