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Exam Code: HPE7-A01

Exam Name HPE Network Campus Access Professional

Certification Provider: HP

Corresponding Certification: HPE Aruba Networking Certified Professional - Campus Access

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HP HPE7-A01 Practice Test 100

Question 990

A wireless voice call has low RSSI but the WLAN team tries to repair it solely with DSCP priority rules. Which first diagnostic check is most useful before changing the network?

  1. Inspect utilization and active client throughput over peak intervals.
  2. Measure client SNR, retry rate and loss at the call location.
  3. Inspect per-queue service rates, starvation and policy limits.
  4. Correlate latency spikes with interface queue depth and storage-transfer counters.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: traffic priority cannot compensate for unusable wireless link quality. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a high-density WLAN has a large number of associated idle devices; an operator assumes association count alone proves capacity overload, but is less direct for the issue at hand: traffic priority cannot compensate for unusable wireless link quality.

C:

This would be a reasonable check when a campus link carries video and backups, and strict high-priority queuing lets video consume bandwidth without a configured limit, but is less direct for the issue at hand: traffic priority cannot compensate for unusable wireless link quality.

D:

This would be a reasonable check when an application experiences 20 ms average latency but bursts to 250 ms during each storage transfer, causing user complaints, but is less direct for the issue at hand: traffic priority cannot compensate for unusable wireless link quality.

Question 991

A wireless network has high airtime consumption from low legacy data rates despite moderate user counts. Which first diagnostic check is most useful before changing the network?

  1. Measure client SNR, retry rate and loss at the call location.
  2. Inspect per-client negotiated rates and airtime distribution.
  3. Inspect ingress markings from student PCs and effective queue assignment.
  4. Inspect supported rates, disconnect reasons and edge SNR.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: low-rate transmissions consume disproportionate channel airtime for the same payload. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a wireless voice call has low RSSI but the WLAN team tries to repair it solely with DSCP priority rules, but is less direct for the issue at hand: low-rate transmissions consume disproportionate channel airtime for the same payload.

C:

This would be a reasonable check when a switch receives ingress traffic marked with elevated priority from untrusted student PCs, starving approved voice traffic, but is less direct for the issue at hand: low-rate transmissions consume disproportionate channel airtime for the same payload.

D:

This would be a reasonable check when a WLAN operator sees clients reconnect every few minutes after aggressive radio minimum-rate changes, despite good aggregate throughput, but is less direct for the issue at hand: low-rate transmissions consume disproportionate channel airtime for the same payload.

Question 992

A data center uplink shows burst loss while average utilization stays below 40 percent. Which first diagnostic check is most useful before changing the network?

  1. Inspect egress queue drops with high-resolution traffic sampling.
  2. Compare uplink/downlink signal balance and per-AP power with roam history.
  3. Inspect per-queue service rates, starvation and policy limits.
  4. Inspect per-client negotiated rates and airtime distribution.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: short high-rate bursts can overflow queues despite acceptable long-term averages. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when an engineer increases every WLAN AP's transmit power to improve coverage, but client roaming deteriorates with larger overlapping cells, but is less direct for the issue at hand: short high-rate bursts can overflow queues despite acceptable long-term averages.

C:

This would be a reasonable check when a campus link carries video and backups, and strict high-priority queuing lets video consume bandwidth without a configured limit, but is less direct for the issue at hand: short high-rate bursts can overflow queues despite acceptable long-term averages.

D:

This would be a reasonable check when a wireless network has high airtime consumption from low legacy data rates despite moderate user counts, but is less direct for the issue at hand: short high-rate bursts can overflow queues despite acceptable long-term averages.

Question 993

An engineer increases every WLAN AP's transmit power to improve coverage, but client roaming deteriorates with larger overlapping cells. Which first diagnostic check is most useful before changing the network?

  1. Compare uplink/downlink signal balance and per-AP power with roam history.
  2. Inspect ingress DSCP values and egress queue classification.
  3. Measure client SNR, retry rate and loss at the call location.
  4. Correlate latency spikes with interface queue depth and storage-transfer counters.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: oversized cells and client/AP power asymmetry can reduce airtime and roaming efficiency. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a voice deployment marks DSCP EF at its phones but the access switch does not trust or preserve the marking on ingress, but is less direct for the issue at hand: oversized cells and client/AP power asymmetry can reduce airtime and roaming efficiency.

C:

This would be a reasonable check when a wireless voice call has low RSSI but the WLAN team tries to repair it solely with DSCP priority rules, but is less direct for the issue at hand: oversized cells and client/AP power asymmetry can reduce airtime and roaming efficiency.

D:

This would be a reasonable check when an application experiences 20 ms average latency but bursts to 250 ms during each storage transfer, causing user complaints, but is less direct for the issue at hand: oversized cells and client/AP power asymmetry can reduce airtime and roaming efficiency.

Question 994

A campus needs voice admission under congestion but the existing profile guarantees QoS to more calls than available airtime. Which first diagnostic check is most useful before changing the network?

  1. Correlate latency spikes with interface queue depth and storage-transfer counters.
  2. Capture DSCP before and after the distribution interface.
  3. Compare call admission decisions with channel utilization and packet delay.
  4. Inspect per-queue service rates, starvation and policy limits.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: priority tagging cannot create unlimited radio airtime or switching buffer capacity. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an application experiences 20 ms average latency but bursts to 250 ms during each storage transfer, causing user complaints, but is less direct for the issue at hand: priority tagging cannot create unlimited radio airtime or switching buffer capacity.

B:

This would be a reasonable check when a video conferencing application uses DSCP AF41, but a policy rewrites all traffic to best effort at the distribution layer, but is less direct for the issue at hand: priority tagging cannot create unlimited radio airtime or switching buffer capacity.

D:

This would be a reasonable check when a campus link carries video and backups, and strict high-priority queuing lets video consume bandwidth without a configured limit, but is less direct for the issue at hand: priority tagging cannot create unlimited radio airtime or switching buffer capacity.

Question 995

A large class sends video traffic through a 1 Gbps uplink attached to multiple multigigabit APs and the uplink becomes saturated. Which first diagnostic check is most useful before changing the network?

  1. Inspect wired uplink utilization and discards during class peak load.
  2. Inspect egress queue drops with high-resolution traffic sampling.
  3. Compare uplink/downlink signal balance and per-AP power with roam history.
  4. Inspect queue occupancy, drop counters and DSCP classification.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: the uplink throughput ceiling is smaller than the aggregate offered wireless load. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a data center uplink shows burst loss while average utilization stays below 40 percent, but is less direct for the issue at hand: the uplink throughput ceiling is smaller than the aggregate offered wireless load.

C:

This would be a reasonable check when an engineer increases every WLAN AP's transmit power to improve coverage, but client roaming deteriorates with larger overlapping cells, but is less direct for the issue at hand: the uplink throughput ceiling is smaller than the aggregate offered wireless load.

D:

This would be a reasonable check when a campus uplink gives backup traffic equal scheduling precedence to interactive voice and latency rises during backups, but is less direct for the issue at hand: the uplink throughput ceiling is smaller than the aggregate offered wireless load.

Question 996

A switch receives ingress traffic marked with elevated priority from untrusted student PCs, starving approved voice traffic. Which first diagnostic check is most useful before changing the network?

  1. Capture DSCP before and after the distribution interface.
  2. Inspect per-client negotiated rates and airtime distribution.
  3. Correlate latency spikes with interface queue depth and storage-transfer counters.
  4. Inspect ingress markings from student PCs and effective queue assignment.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: uncontrolled client markings let low-trust devices consume protected QoS queues. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a video conferencing application uses DSCP AF41, but a policy rewrites all traffic to best effort at the distribution layer, but is less direct for the issue at hand: uncontrolled client markings let low-trust devices consume protected QoS queues.

B:

This would be a reasonable check when a wireless network has high airtime consumption from low legacy data rates despite moderate user counts, but is less direct for the issue at hand: uncontrolled client markings let low-trust devices consume protected QoS queues.

C:

This would be a reasonable check when an application experiences 20 ms average latency but bursts to 250 ms during each storage transfer, causing user complaints, but is less direct for the issue at hand: uncontrolled client markings let low-trust devices consume protected QoS queues.

Question 997

A high-density WLAN has a large number of associated idle devices; an operator assumes association count alone proves capacity overload. Which first diagnostic check is most useful before changing the network?

  1. Inspect ingress DSCP values and egress queue classification.
  2. Inspect utilization and active client throughput over peak intervals.
  3. Inspect queue occupancy, drop counters and DSCP classification.
  4. Inspect ingress markings from student PCs and effective queue assignment.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: idle associations consume a different resource profile than active airtime-intensive clients. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a voice deployment marks DSCP EF at its phones but the access switch does not trust or preserve the marking on ingress, but is less direct for the issue at hand: idle associations consume a different resource profile than active airtime-intensive clients.

C:

This would be a reasonable check when a campus uplink gives backup traffic equal scheduling precedence to interactive voice and latency rises during backups, but is less direct for the issue at hand: idle associations consume a different resource profile than active airtime-intensive clients.

D:

This would be a reasonable check when a switch receives ingress traffic marked with elevated priority from untrusted student PCs, starving approved voice traffic, but is less direct for the issue at hand: idle associations consume a different resource profile than active airtime-intensive clients.

Question 998

A campus link carries video and backups, and strict high-priority queuing lets video consume bandwidth without a configured limit. Which first diagnostic check is most useful before changing the network?

  1. Correlate latency spikes with interface queue depth and storage-transfer counters.
  2. Inspect per-queue service rates, starvation and policy limits.
  3. Inspect ingress DSCP values and egress queue classification.
  4. Measure client SNR, retry rate and loss at the call location.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: unlimited strict priority may starve lower-priority but necessary traffic under sustained load. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an application experiences 20 ms average latency but bursts to 250 ms during each storage transfer, causing user complaints, but is less direct for the issue at hand: unlimited strict priority may starve lower-priority but necessary traffic under sustained load.

C:

This would be a reasonable check when a voice deployment marks DSCP EF at its phones but the access switch does not trust or preserve the marking on ingress, but is less direct for the issue at hand: unlimited strict priority may starve lower-priority but necessary traffic under sustained load.

D:

This would be a reasonable check when a wireless voice call has low RSSI but the WLAN team tries to repair it solely with DSCP priority rules, but is less direct for the issue at hand: unlimited strict priority may starve lower-priority but necessary traffic under sustained load.

Question 999

A WLAN operator sees clients reconnect every few minutes after aggressive radio minimum-rate changes, despite good aggregate throughput. Which first diagnostic check is most useful before changing the network?

  1. Inspect ingress DSCP values and egress queue classification.
  2. Inspect supported rates, disconnect reasons and edge SNR.
  3. Inspect ingress markings from student PCs and effective queue assignment.
  4. Inspect per-client negotiated rates and airtime distribution.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: a raised mandatory/basic rate can prevent distant or legacy clients from maintaining reliable associations. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a voice deployment marks DSCP EF at its phones but the access switch does not trust or preserve the marking on ingress, but is less direct for the issue at hand: a raised mandatory/basic rate can prevent distant or legacy clients from maintaining reliable associations.

C:

This would be a reasonable check when a switch receives ingress traffic marked with elevated priority from untrusted student PCs, starving approved voice traffic, but is less direct for the issue at hand: a raised mandatory/basic rate can prevent distant or legacy clients from maintaining reliable associations.

D:

This would be a reasonable check when a wireless network has high airtime consumption from low legacy data rates despite moderate user counts, but is less direct for the issue at hand: a raised mandatory/basic rate can prevent distant or legacy clients from maintaining reliable associations.

Question 1000

An application experiences 20 ms average latency but bursts to 250 ms during each storage transfer, causing user complaints. Which first diagnostic check is most useful before changing the network?

  1. Inspect per-client negotiated rates and airtime distribution.
  2. Correlate latency spikes with interface queue depth and storage-transfer counters.
  3. Measure client SNR, retry rate and loss at the call location.
  4. Inspect wired uplink utilization and discards during class peak load.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: an acceptable mean obscures severe queueing spikes correlated with bulk traffic. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a wireless network has high airtime consumption from low legacy data rates despite moderate user counts, but is less direct for the issue at hand: an acceptable mean obscures severe queueing spikes correlated with bulk traffic.

C:

This would be a reasonable check when a wireless voice call has low RSSI but the WLAN team tries to repair it solely with DSCP priority rules, but is less direct for the issue at hand: an acceptable mean obscures severe queueing spikes correlated with bulk traffic.

D:

This would be a reasonable check when a large class sends video traffic through a 1 Gbps uplink attached to multiple multigigabit APs and the uplink becomes saturated, but is less direct for the issue at hand: an acceptable mean obscures severe queueing spikes correlated with bulk traffic.