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NVIDIA NCP-AII Practice Test 91

Question 900

During an NVIDIA AI factory acceptance test, engineers discover: An installer never verifies receive power after patch-panel cleaning and later sees network retries. Which THREE elements together establish the appropriate corrective action, independent test evidence and verified successful outcome? Select THREE answers.

  1. Review transceiver diagnostics, FEC corrected and uncorrectable counters, BER trends and optical power.
  2. Plan approved-duration coordinated burn-in with continuous telemetry and clean test resource reservations.
  3. Collect optical power and FEC or BER data over representative load, then isolate unsafe optics or fibers.
  4. Inspect long-run NCCL logs, error rate, interconnect counters, rank liveness and timing variation.
  5. Declare cable quality proven by the absence of hard link-down events while corrected FEC errors rise rapidly.
  6. The link maintains vendor-supported signal margin and acceptable bit-error behavior during sustained traffic.

Explanation

Correct Answers

A:

This is the direct operational evidence to investigate: Review transceiver diagnostics, FEC corrected and uncorrectable counters, BER trends and optical power. Observed scenario: An installer never verifies receive power after patch-panel cleaning and later sees network retries. The governing mechanism is: Forward-error correction can mask deteriorating physical signal quality before an interface hard-down occurs.

C:

This is an appropriate correction for Optical FEC BER validation during burn-in: Collect optical power and FEC or BER data over representative load, then isolate unsafe optics or fibers. Observed scenario: An installer never verifies receive power after patch-panel cleaning and later sees network retries. The governing mechanism is: Forward-error correction can mask deteriorating physical signal quality before an interface hard-down occurs.

F:

This is an observable verified result, not merely a claimed configuration change: The link maintains vendor-supported signal margin and acceptable bit-error behavior during sustained traffic. Observed scenario: An installer never verifies receive power after patch-panel cleaning and later sees network retries.

Incorrect Answers

B:

This alternative is relevant to Long-duration burn-in schedule and symptom correlation but does not directly resolve the current Optical FEC BER validation during burn-in issue: Plan approved-duration coordinated burn-in with continuous telemetry and clean test resource reservations. Observed scenario: An installer never verifies receive power after patch-panel cleaning and later sees network retries. The governing mechanism is: Forward-error correction can mask deteriorating physical signal quality before an interface hard-down occurs.

D:

This alternative is relevant to Multi-node NCCL repeated burn-in but does not directly resolve the current Optical FEC BER validation during burn-in issue: Inspect long-run NCCL logs, error rate, interconnect counters, rank liveness and timing variation. Observed scenario: An installer never verifies receive power after patch-panel cleaning and later sees network retries.

E:

This tempting but unsafe shortcut is not a sufficient remediation for Optical FEC BER validation during burn-in: Declare cable quality proven by the absence of hard link-down events while corrected FEC errors rise rapidly. Observed scenario: An installer never verifies receive power after patch-panel cleaning and later sees network retries. The governing mechanism is: Forward-error correction can mask deteriorating physical signal quality before an interface hard-down occurs. The proportionate action is: Collect optical power and FEC or BER data over representative load, then isolate unsafe optics or fibers. A direct check is: Review transceiver diagnostics, FEC corrected and uncorrectable counters, BER trends and optical power. The acceptance condition is: The link maintains vendor-supported signal margin and acceptable bit-error behavior during sustained traffic.

Question 901

A production GPU cluster review identifies this condition: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed. Which operational response is MOST appropriate to address the root issue? Select ONE best answer.

  1. Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability.
  2. Use multi-flow cluster-scale throughput tests to measure effective bisection and hotspot oversubscription.
  3. Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.
  4. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.

Explanation

Correct Answer

C:

This is an appropriate correction for Transceiver firmware and negotiated link test: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

Incorrect Answers

A:

This alternative is relevant to InfiniBand link state LID and physical activation but does not directly resolve the current Transceiver firmware and negotiated link test issue: Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

B:

This alternative is relevant to AI fabric bisection and oversubscription test but does not directly resolve the current Transceiver firmware and negotiated link test issue: Use multi-flow cluster-scale throughput tests to measure effective bisection and hotspot oversubscription. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

D:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.

Question 902

In a professional AI infrastructure deployment, a technician observes: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed. Which underlying infrastructure principle BEST explains the issue? Select ONE best answer.

  1. NCCL collective execution stresses GPU peer paths and coordination beyond the capabilities of independent CUDA kernels.
  2. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  3. Sustained accelerator load can reveal thermal and electrical limits not visible during idle or brief smoke checks.
  4. Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

Explanation

Correct Answer

D:

This is the governing infrastructure principle: Port link negotiation depends on mutually supported optical or electrical signaling and component revisions. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

Incorrect Answers

A:

That option concerns Intra-node NCCL all-reduce test scope. The proportionate action is: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.

B:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

C:

This alternative is relevant to GPU thermal power and memory single-node burn-in but does not directly resolve the current Transceiver firmware and negotiated link test issue: Sustained accelerator load can reveal thermal and electrical limits not visible during idle or brief smoke checks. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

Question 903

The cluster operations team needs to evaluate this situation: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  2. Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters.
  3. Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history.
  4. Inspect dcgmi diag suite results, entity IDs, error logs, driver state and conflicting running workloads.

Explanation

Correct Answer

B:

This is the direct operational evidence to investigate: Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

Incorrect Answers

A:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

C:

This alternative is relevant to InfiniBand link error and recovery counters but does not directly resolve the current Transceiver firmware and negotiated link test issue: Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

D:

This alternative is relevant to DCGM active single-node diagnostic suites but does not directly resolve the current Transceiver firmware and negotiated link test issue: Inspect dcgmi diag suite results, entity IDs, error logs, driver state and conflicting running workloads. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

Question 904

At a multi-node AI infrastructure handoff, the team records: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed. After corrective work, which observable result BEST confirms that the requirement is met? Select ONE best answer.

  1. The node sustains approved workload performance without unplanned throttling, errors or facility alarms.
  2. All intended GPUs participate in successful collectives with expected local throughput and no fabric faults.
  3. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  4. All intended links remain stable at supported speed with correct firmware and low error rate.

Explanation

Correct Answer

D:

This is an observable verified result, not merely a claimed configuration change: All intended links remain stable at supported speed with correct firmware and low error rate. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

Incorrect Answers

A:

This alternative is relevant to GPU thermal power and memory single-node burn-in but does not directly resolve the current Transceiver firmware and negotiated link test issue: The node sustains approved workload performance without unplanned throttling, errors or facility alarms. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

B:

This alternative is relevant to Intra-node NCCL all-reduce test scope but does not directly resolve the current Transceiver firmware and negotiated link test issue: All intended GPUs participate in successful collectives with expected local throughput and no fabric faults. Observed scenario: Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed.

C:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. Two ports use approved optics but one transceiver runs an unexpected revision and cannot establish stable speed. Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

Question 905

During an NVIDIA AI factory acceptance test, engineers discover: A physical rack audit compares cable labels but not actual port firmware and FEC mode. Which operational response is MOST appropriate to address the root issue? Select ONE best answer.

  1. Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.
  2. Run supported single-node NCCL collectives spanning the intended local GPUs and compare with baseline topology.
  3. Compare approved switch OS and firmware revisions with interoperability requirements and test the actual fabric service.
  4. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.

Explanation

Correct Answer

A:

This is an appropriate correction for Transceiver firmware and negotiated link test: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

Incorrect Answers

B:

This alternative is relevant to Intra-node NCCL all-reduce test scope but does not directly resolve the current Transceiver firmware and negotiated link test issue: Run supported single-node NCCL collectives spanning the intended local GPUs and compare with baseline topology. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

C:

This alternative is relevant to Switch firmware and software interoperability but does not directly resolve the current Transceiver firmware and negotiated link test issue: Compare approved switch OS and firmware revisions with interoperability requirements and test the actual fabric service. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

D:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. A physical rack audit compares cable labels but not actual port firmware and FEC mode.

Question 906

A production GPU cluster review identifies this condition: A physical rack audit compares cable labels but not actual port firmware and FEC mode. Which underlying infrastructure principle BEST explains the issue? Select ONE best answer.

  1. An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup.
  2. Sustained accelerator load can reveal thermal and electrical limits not visible during idle or brief smoke checks.
  3. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  4. Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

Explanation

Correct Answer

D:

This is the governing infrastructure principle: Port link negotiation depends on mutually supported optical or electrical signaling and component revisions. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

Incorrect Answers

A:

That option concerns InfiniBand link state LID and physical activation. The proportionate action is: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.

B:

This alternative is relevant to GPU thermal power and memory single-node burn-in but does not directly resolve the current Transceiver firmware and negotiated link test issue: Sustained accelerator load can reveal thermal and electrical limits not visible during idle or brief smoke checks. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

C:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. A physical rack audit compares cable labels but not actual port firmware and FEC mode. Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

Question 907

In a professional AI infrastructure deployment, a technician observes: A physical rack audit compares cable labels but not actual port firmware and FEC mode. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  2. Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters.
  3. Inspect per-tier utilization, congestion counters, full-rack NCCL measurements and ECMP distribution.
  4. Inspect GPU temperature and power traces, clock throttle reasons, error counters and completed stress duration.

Explanation

Correct Answer

B:

This is the direct operational evidence to investigate: Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

Incorrect Answers

A:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode. The governing mechanism is: Port link negotiation depends on mutually supported optical or electrical signaling and component revisions. The proportionate action is: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.

C:

This alternative is relevant to AI fabric bisection and oversubscription test but does not directly resolve the current Transceiver firmware and negotiated link test issue: Inspect per-tier utilization, congestion counters, full-rack NCCL measurements and ECMP distribution. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

D:

This alternative is relevant to GPU thermal power and memory single-node burn-in but does not directly resolve the current Transceiver firmware and negotiated link test issue: Inspect GPU temperature and power traces, clock throttle reasons, error counters and completed stress duration. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

Question 908

The cluster operations team needs to evaluate this situation: A physical rack audit compares cable labels but not actual port firmware and FEC mode. After corrective work, which observable result BEST confirms that the requirement is met? Select ONE best answer.

  1. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  2. All intended links remain stable at supported speed with correct firmware and low error rate.
  3. All intended GPUs participate in successful collectives with expected local throughput and no fabric faults.
  4. Every intended node is accounted for and deviations are dispositioned before workload benchmarking begins.

Explanation

Correct Answer

B:

This is an observable verified result, not merely a claimed configuration change: All intended links remain stable at supported speed with correct firmware and low error rate. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

Incorrect Answers

A:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode. The governing mechanism is: Port link negotiation depends on mutually supported optical or electrical signaling and component revisions. The proportionate action is: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing. A direct check is: Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters. The acceptance condition is: All intended links remain stable at supported speed with correct firmware and low error rate.

C:

This alternative is relevant to Intra-node NCCL all-reduce test scope but does not directly resolve the current Transceiver firmware and negotiated link test issue: All intended GPUs participate in successful collectives with expected local throughput and no fabric faults. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

D:

This alternative is relevant to Cluster-wide preflight hardware inventory but does not directly resolve the current Transceiver firmware and negotiated link test issue: Every intended node is accounted for and deviations are dispositioned before workload benchmarking begins. Observed scenario: A physical rack audit compares cable labels but not actual port firmware and FEC mode.

Question 909

At a multi-node AI infrastructure handoff, the team records: A replaced optical unit links for seconds then fails after an uncoordinated switch software update. Which operational response is MOST appropriate to address the root issue? Select ONE best answer.

  1. Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.
  2. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  3. Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability.
  4. Capture a reproducible preflight inventory of node hardware, software, connections and expected acceptance tests.

Explanation

Correct Answer

A:

This is an appropriate correction for Transceiver firmware and negotiated link test: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing. Observed scenario: A replaced optical unit links for seconds then fails after an uncoordinated switch software update.

Incorrect Answers

B:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. A replaced optical unit links for seconds then fails after an uncoordinated switch software update.

C:

This alternative is relevant to InfiniBand link state LID and physical activation but does not directly resolve the current Transceiver firmware and negotiated link test issue: Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability. Observed scenario: A replaced optical unit links for seconds then fails after an uncoordinated switch software update.

D:

This alternative is relevant to Cluster-wide preflight hardware inventory but does not directly resolve the current Transceiver firmware and negotiated link test issue: Capture a reproducible preflight inventory of node hardware, software, connections and expected acceptance tests. Observed scenario: A replaced optical unit links for seconds then fails after an uncoordinated switch software update.

Question 910

During an NVIDIA AI factory acceptance test, engineers discover: A replaced optical unit links for seconds then fails after an uncoordinated switch software update. Which TWO complementary elements are needed: the correct technical action and the strongest independent diagnostic evidence? Select TWO answers.

  1. Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match.
  2. Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.
  3. Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters.
  4. Inspect BlueField version inventory, DOCA compatibility, BMC boot state and functional network tests.
  5. Run supported single-node NCCL collectives spanning the intended local GPUs and compare with baseline topology.

Explanation

Correct Answers

B:

This is an appropriate correction for Transceiver firmware and negotiated link test: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing. Observed scenario: A replaced optical unit links for seconds then fails after an uncoordinated switch software update. The governing mechanism is: Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

C:

This is the direct operational evidence to investigate: Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters. Observed scenario: A replaced optical unit links for seconds then fails after an uncoordinated switch software update.

Incorrect Answers

A:

This tempting but unsafe shortcut is not a sufficient remediation for Transceiver firmware and negotiated link test: Assume two identical connector cages guarantee that transceiver firmware and host port configuration always match. A replaced optical unit links for seconds then fails after an uncoordinated switch software update. Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

D:

That option concerns BlueField firmware verification after deployment. Port link negotiation depends on mutually supported optical or electrical signaling and component revisions.

E:

This alternative is relevant to Intra-node NCCL all-reduce test scope but does not directly resolve the current Transceiver firmware and negotiated link test issue: Run supported single-node NCCL collectives spanning the intended local GPUs and compare with baseline topology. Observed scenario: A replaced optical unit links for seconds then fails after an uncoordinated switch software update.

NCP-AI Infrastructure (NCP-AII) Practice Tests