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Question 680
An internal application responds slowly from one server even when packet captures show low network latency and no drops. What root cause should be investigated?
- Endpoint application saturation
- Endpoint duplex or flow-control behavior
- Endpoint DNS resolver problem
- Faulty endpoint network driver
Explanation
Correct Answer
A:The service may be limited by application CPU or backend resources. CPU, storage or application-thread exhaustion can cause slow responses even when network counters are healthy.
Incorrect Answers
B:A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop. But this does not address the case requirement to identify endpoint application bottleneck.
C:Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity. But this does not address the case requirement to identify endpoint application bottleneck.
D:A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors. But this does not address the case requirement to identify endpoint application bottleneck.
Question 681
Users can connect to server IP addresses immediately but hostname connections stall for several seconds. What local dependency is implicated?
- PoE negotiation class mismatch
- Endpoint DNS resolver problem
- Insufficient remaining PoE power budget
- Faulty endpoint network driver
Explanation
Correct Answer
B:Slow DNS resolution can delay sessions without a packet path failure. Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity.
Incorrect Answers
A:A power class or LLDP power mismatch may leave an endpoint underpowered despite link carrier. But this does not address the case requirement to identify endpoint DNS delay.
C:An overloaded switch PoE budget may deny or throttle the power a connected endpoint requires. But this does not address the case requirement to identify endpoint DNS delay.
D:A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors. But this does not address the case requirement to identify endpoint DNS delay.
Question 682
A bank of APs draws more watts than the switch's remaining PoE capacity, and some devices remain off. Which performance condition applies?
- Endpoint DNS resolver problem
- Insufficient remaining PoE power budget
- Faulty endpoint network driver
- Endpoint duplex or flow-control behavior
Explanation
Correct Answer
B:Insufficient PoE power is limiting endpoint availability. An overloaded switch PoE budget may deny or throttle the power a connected endpoint requires.
Incorrect Answers
A:Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity. But this does not address the case requirement to identify a power allocation shortfall.
C:A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors. But this does not address the case requirement to identify a power allocation shortfall.
D:A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop. But this does not address the case requirement to identify a power allocation shortfall.
Question 683
A desk phone loses features under load while the switch has 300W of unused system PoE budget; LLDP shows the phone negotiated too little per-port power for its requested class. What is the most specific cause?
- Insufficient remaining PoE power budget
- PoE negotiation class mismatch
- Endpoint duplex or flow-control behavior
- Endpoint DNS resolver problem
Explanation
Correct Answer
B:Power negotiation is insufficient for the requested per-port class even though the system budget has ample spare capacity. A power class or LLDP power mismatch may leave an endpoint underpowered despite link carrier.
Incorrect Answers
A:An overloaded switch PoE budget may deny or throttle the power a connected endpoint requires. But this does not address the case requirement to identify a per-port LLDP PoE classification mismatch.
C:A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop. But this does not address the case requirement to identify a per-port LLDP PoE classification mismatch.
D:Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity. But this does not address the case requirement to identify a per-port LLDP PoE classification mismatch.
Question 684
Traceroute and link counters are normal but database response time doubles when server CPU maxes out. Where is the performance limit?
- Endpoint duplex or flow-control behavior
- Endpoint DNS resolver problem
- Endpoint application saturation
- Insufficient remaining PoE power budget
Explanation
Correct Answer
C:Server application resources are saturated rather than the switched path. CPU, storage or application-thread exhaustion can cause slow responses even when network counters are healthy.
Incorrect Answers
A:A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop. But this does not address the case requirement to identify end-host computation overload.
B:Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity. But this does not address the case requirement to identify end-host computation overload.
D:An overloaded switch PoE budget may deny or throttle the power a connected endpoint requires. But this does not address the case requirement to identify end-host computation overload.
Question 685
After upgrading to a specific CX release, several switches begin a reproducible forwarding issue absent on earlier code. Which possibility warrants vendor advisory review?
- Uncontrolled ARP or broadcast punt rate
- Firmware defect in affected release
- High memory utilization or exhaustion
- Excessive syslog or telemetry export volume
Explanation
Correct Answer
B:A release-specific software defect may explain correlated failures. A reproducible issue introduced after a switch OS upgrade may require vendor investigation or corrected release.
Incorrect Answers
A:Exception packets that repeatedly reach CPU can starve routing and management processes. But this does not address the case requirement to identify firmware regression.
C:Resource pressure may disrupt control-plane services and management agents even with healthy link counters. But this does not address the case requirement to identify firmware regression.
D:An overly verbose instrumentation configuration can burden processing and transport resources. But this does not address the case requirement to identify firmware regression.
Question 686
Device memory use steadily climbs until management sessions fail, but interface counters remain clean. What likely contributes?
- Misconfigured NAE agent action frequency
- Firmware defect in affected release
- A long-running stuck management process
- High memory utilization or exhaustion
Explanation
Correct Answer
D:Exhausted system memory affects platform services. Resource pressure may disrupt control-plane services and management agents even with healthy link counters.
Incorrect Answers
A:A monitoring agent with overaggressive polling or action callbacks can contribute to load or unnecessary events. But this does not address the case requirement to identify memory resource pressure.
B:A reproducible issue introduced after a switch OS upgrade may require vendor investigation or corrected release. But this does not address the case requirement to identify memory resource pressure.
C:A hung service may affect API or monitoring response despite normal interface forwarding. But this does not address the case requirement to identify memory resource pressure.
Question 687
An operator enables debug-level logging for every packet and switch management becomes sluggish. What telemetry setting should be reviewed?
- Excessive syslog or telemetry export volume
- A long-running stuck management process
- High memory utilization or exhaustion
- Uncontrolled ARP or broadcast punt rate
Explanation
Correct Answer
A:Oververbose logging can consume control-plane and storage resources. An overly verbose instrumentation configuration can burden processing and transport resources.
Incorrect Answers
B:A hung service may affect API or monitoring response despite normal interface forwarding. But this does not address the case requirement to identify excessive logging overhead.
C:Resource pressure may disrupt control-plane services and management agents even with healthy link counters. But this does not address the case requirement to identify excessive logging overhead.
D:Exception packets that repeatedly reach CPU can starve routing and management processes. But this does not address the case requirement to identify excessive logging overhead.
Question 688
A storm of ARP exceptions is punted to the CPU, delaying BGP timers with low physical interface errors. Which resource bottleneck fits?
- Misconfigured NAE agent action frequency
- Uncontrolled ARP or broadcast punt rate
- Excessive syslog or telemetry export volume
- A long-running stuck management process
Explanation
Correct Answer
B:Control-plane packet processing is overwhelmed by exception traffic. Exception packets that repeatedly reach CPU can starve routing and management processes.
Incorrect Answers
A:A monitoring agent with overaggressive polling or action callbacks can contribute to load or unnecessary events. But this does not address the case requirement to identify high CPU punt load.
C:An overly verbose instrumentation configuration can burden processing and transport resources. But this does not address the case requirement to identify high CPU punt load.
D:A hung service may affect API or monitoring response despite normal interface forwarding. But this does not address the case requirement to identify high CPU punt load.
Question 689
A custom NAE agent runs expensive actions on every short interval and alert storms begin. What monitoring configuration may be causing impact?
- A long-running stuck management process
- Misconfigured NAE agent action frequency
- Firmware defect in affected release
- Excessive syslog or telemetry export volume
Explanation
Correct Answer
B:Excessive agent execution frequency adds device overhead. A monitoring agent with overaggressive polling or action callbacks can contribute to load or unnecessary events.
Incorrect Answers
A:A hung service may affect API or monitoring response despite normal interface forwarding. But this does not address the case requirement to identify agent-trigger policy pressure.
C:A reproducible issue introduced after a switch OS upgrade may require vendor investigation or corrected release. But this does not address the case requirement to identify agent-trigger policy pressure.
D:An overly verbose instrumentation configuration can burden processing and transport resources. But this does not address the case requirement to identify agent-trigger policy pressure.
Question 690
REST calls hang while data forwarding and processor utilization remain normal; one administrative service is stuck. What could be failing?
- Firmware defect in affected release
- High memory utilization or exhaustion
- A long-running stuck management process
- Uncontrolled ARP or broadcast punt rate
Explanation
Correct Answer
C:The management daemon may be unresponsive independent of packet forwarding. A hung service may affect API or monitoring response despite normal interface forwarding.
Incorrect Answers
A:A reproducible issue introduced after a switch OS upgrade may require vendor investigation or corrected release. But this does not address the case requirement to identify management-service hang.
B:Resource pressure may disrupt control-plane services and management agents even with healthy link counters. But this does not address the case requirement to identify management-service hang.
D:Exception packets that repeatedly reach CPU can starve routing and management processes. But this does not address the case requirement to identify management-service hang.
HPE Network Switching Professional (HPE7-A08) Practice Tests