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Question 620
A redundant routing pair shows errors after only one side received new firmware. What should be reviewed?
- Coordinate maintenance and communications
- Monitor post-fix service indicators
- Compare applied config against known-good snapshot
- Validate supported firmware and peers
Explanation
Correct Answer
D:Peer release compatibility and upgrade sequence are critical. Check image compatibility, release notes and peer dependencies before proceeding.
Incorrect Answers
A:Ownership, downtime windows and escalation govern disruptive recovery actions. But this does not address the case requirement to reestablish compatible running software.
B:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to reestablish compatible running software.
C:A configuration diff isolates unexpected commands or missing settings after changes. But this does not address the case requirement to reestablish compatible running software.
Question 621
An engineer restores a backup but closes the incident without checking packet drops and neighbor health. What remains?
- Compare applied config against known-good snapshot
- Coordinate maintenance and communications
- Monitor post-fix service indicators
- Use approved rollback or checkpoint
Explanation
Correct Answer
C:Operational and performance validation must follow restore. Counters, route states, application health and alarms confirm recovery under real load.
Incorrect Answers
A:A configuration diff isolates unexpected commands or missing settings after changes. But this does not address the case requirement to confirm the actual network has recovered.
B:Ownership, downtime windows and escalation govern disruptive recovery actions. But this does not address the case requirement to confirm the actual network has recovered.
D:A tested restore can return a failed deployment to a stable baseline. But this does not address the case requirement to confirm the actual network has recovered.
Question 622
A 1G uplink averages 99% utilization while egress discard counters climb at lunch. What best explains bulk transfer slowdown?
- QoS scheduling policy mismatch
- Path routing asymmetry
- Incorrect DSCP classification
- Egress utilization and output drops
Explanation
Correct Answer
D:The output port is oversubscribed during the busy interval. Sustained offered load above available egress capacity causes queue buildup and output packet drops.
Incorrect Answers
A:The configured queue scheduler may not protect delay-sensitive traffic under contention. But this does not address the case requirement to identify bandwidth saturation and dropped egress packets.
B: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 bandwidth saturation and dropped egress packets.
C: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 bandwidth saturation and dropped egress packets.
Question 623
Voice packets share a busy queue with nightly backups even though bandwidth is available at other times. What likely explains added voice jitter?
- Physical FCS error condition
- Path routing asymmetry
- QoS scheduling policy mismatch
- Endpoint receive-window bottleneck
Explanation
Correct Answer
C:The active scheduling policy does not reserve adequate service for delay-sensitive packets. The configured queue scheduler may not protect delay-sensitive traffic under contention.
Incorrect Answers
A:Damaged copper or optics introduce corrupted frames and retransmission independent of application QoS. But this does not address the case requirement to identify misapplied queue scheduling during contention.
B: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 misapplied queue scheduling during contention.
D:The destination may acknowledge slowly because its TCP stack or host resources cannot ingest data. But this does not address the case requirement to identify misapplied queue scheduling during contention.
Question 624
Call packets carry DSCP 0 on the access uplink but the design expects expedited forwarding. Which mechanism best explains why voice receives best-effort treatment?
- QoS scheduling policy mismatch
- Incorrect DSCP classification
- Egress utilization and output drops
- Physical FCS error condition
Explanation
Correct Answer
B:Traffic classification fails to preserve the intended marking. Misclassified ingress traffic can enter the wrong priority queue even when transport bandwidth is sufficient.
Incorrect Answers
A:The configured queue scheduler may not protect delay-sensitive traffic under contention. But this does not address the case requirement to identify DSCP mismatch and resulting queue selection.
C:Sustained offered load above available egress capacity causes queue buildup and output packet drops. But this does not address the case requirement to identify DSCP mismatch and resulting queue selection.
D:Damaged copper or optics introduce corrupted frames and retransmission independent of application QoS. But this does not address the case requirement to identify DSCP mismatch and resulting queue selection.
Question 625
A fiber uplink has low throughput and CRC errors while utilization is only 30%. Which cause should be investigated before rewriting QoS?
- QoS scheduling policy mismatch
- Endpoint receive-window bottleneck
- Physical FCS error condition
- Egress utilization and output drops
Explanation
Correct Answer
C:Physical corruption requires frame retransmissions and can lower effective throughput. Damaged copper or optics introduce corrupted frames and retransmission independent of application QoS.
Incorrect Answers
A:The configured queue scheduler may not protect delay-sensitive traffic under contention. But this does not address the case requirement to identify link corruption rather than congestion.
B:The destination may acknowledge slowly because its TCP stack or host resources cannot ingest data. But this does not address the case requirement to identify link corruption rather than congestion.
D:Sustained offered load above available egress capacity causes queue buildup and output packet drops. But this does not address the case requirement to identify link corruption rather than congestion.
Question 626
One file server delivers data slowly although upstream links show spare capacity and no discards. Its NIC receive buffers fill repeatedly. What bottleneck fits?
- QoS scheduling policy mismatch
- Egress utilization and output drops
- Path routing asymmetry
- Endpoint receive-window bottleneck
Explanation
Correct Answer
D:The receiving host cannot process arriving traffic quickly enough. The destination may acknowledge slowly because its TCP stack or host resources cannot ingest data.
Incorrect Answers
A:The configured queue scheduler may not protect delay-sensitive traffic under contention. But this does not address the case requirement to identify endpoint receive limitations.
B:Sustained offered load above available egress capacity causes queue buildup and output packet drops. But this does not address the case requirement to identify endpoint receive limitations.
C: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 endpoint receive limitations.
Question 627
A client-to-server path is fast but replies traverse an unexpectedly long alternate WAN hop. Local egress drops are zero. Which factor best explains high transaction latency?
- Egress utilization and output drops
- Path routing asymmetry
- QoS scheduling policy mismatch
- Incorrect DSCP classification
Explanation
Correct Answer
B:Forward and return path asymmetry adds an alternate delay component. A return route or path change can cause variable performance not explained by local queue utilization.
Incorrect Answers
A:Sustained offered load above available egress capacity causes queue buildup and output packet drops. But this does not address the case requirement to identify path asymmetry rather than local queue loss.
C:The configured queue scheduler may not protect delay-sensitive traffic under contention. But this does not address the case requirement to identify path asymmetry rather than local queue loss.
D: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 path asymmetry rather than local queue loss.
Question 628
At a site handoff, input traffic is 2.5Gbps but the provider egress is 1Gbps; output queue drops rise. What is the principal performance limit?
- Path routing asymmetry
- QoS scheduling policy mismatch
- Egress utilization and output drops
- Endpoint receive-window bottleneck
Explanation
Correct Answer
C:Packets exceed egress capacity and are discarded. Sustained offered load above available egress capacity causes queue buildup and output packet drops.
Incorrect Answers
A: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 diagnose a saturated downstream handoff.
B:The configured queue scheduler may not protect delay-sensitive traffic under contention. But this does not address the case requirement to diagnose a saturated downstream handoff.
D:The destination may acknowledge slowly because its TCP stack or host resources cannot ingest data. But this does not address the case requirement to diagnose a saturated downstream handoff.
Question 629
Priority voice traffic loses priority after passing through a trust-boundary port and shows DSCP 0. Where is the likely defect?
- Incorrect DSCP classification
- Egress utilization and output drops
- Endpoint receive-window bottleneck
- QoS scheduling policy mismatch
Explanation
Correct Answer
A:Incorrect classification or remarking at the ingress trust boundary. Misclassified ingress traffic can enter the wrong priority queue even when transport bandwidth is sufficient.
Incorrect Answers
B:Sustained offered load above available egress capacity causes queue buildup and output packet drops. But this does not address the case requirement to identify loss of service marking.
C:The destination may acknowledge slowly because its TCP stack or host resources cannot ingest data. But this does not address the case requirement to identify loss of service marking.
D:The configured queue scheduler may not protect delay-sensitive traffic under contention. But this does not address the case requirement to identify loss of service marking.
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.
HPE Network Switching Professional (HPE7-A08) Practice Tests