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NVIDIA NCP-AII Practice Test 88

Question 870

During an NVIDIA AI factory acceptance test, engineers discover: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. Which TWO complementary elements are needed: the correct technical action and the strongest independent diagnostic evidence? Select TWO answers.

  1. Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters.
  2. Schedule supported active DCGM diagnostics for the relevant GPU class and investigate detailed failures.
  3. Run supported verbs bandwidth and latency tests across representative peers while examining physical counters.
  4. Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history.
  5. Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency.

Explanation

Correct Answers

A:

This is the direct operational evidence to investigate: Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path.

C:

This is an appropriate correction for InfiniBand verbs microbenchmark bandwidth latency: Run supported verbs bandwidth and latency tests across representative peers while examining physical counters. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. The governing mechanism is: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools.

Incorrect Answers

B:

This alternative is relevant to DCGM active single-node diagnostic suites but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Schedule supported active DCGM diagnostics for the relevant GPU class and investigate detailed failures. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path.

D:

This alternative is relevant to InfiniBand link error and recovery counters but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path.

E:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand verbs microbenchmark bandwidth latency: Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency. An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools.

Question 871

A production GPU cluster review identifies this condition: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history.
  2. Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency.
  3. Inspect dcgmi diag suite results, entity IDs, error logs, driver state and conflicting running workloads.
  4. Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters.

Explanation

Correct Answer

D:

This is the direct operational evidence to investigate: Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. The governing mechanism is: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools.

Incorrect Answers

A:

This alternative is relevant to InfiniBand link error and recovery counters but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. The governing mechanism is: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools.

B:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand verbs microbenchmark bandwidth latency: Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. The governing mechanism is: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools. The proportionate action is: Run supported verbs bandwidth and latency tests across representative peers while examining physical counters.

C:

This alternative is relevant to DCGM active single-node diagnostic suites but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Inspect dcgmi diag suite results, entity IDs, error logs, driver state and conflicting running workloads. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path.

Question 872

In a professional AI infrastructure deployment, a technician observes: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. After corrective work, which observable result BEST confirms that the requirement is met? Select ONE best answer.

  1. Representative peer pairs meet approved RDMA bandwidth and latency targets repeatably.
  2. All required HCA links are Active with valid fabric membership and can reach intended peer endpoints.
  3. Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency.
  4. Link errors stabilize below approved thresholds and NCCL performance recovers under repeated load.

Explanation

Correct Answer

A:

This is an observable verified result, not merely a claimed configuration change: Representative peer pairs meet approved RDMA bandwidth and latency targets repeatably. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path.

Incorrect Answers

B:

This alternative is relevant to InfiniBand link state LID and physical activation but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: All required HCA links are Active with valid fabric membership and can reach intended peer endpoints. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path.

C:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand verbs microbenchmark bandwidth latency: Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path. The governing mechanism is: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools. The proportionate action is: Run supported verbs bandwidth and latency tests across representative peers while examining physical counters. A direct check is: Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters. The acceptance condition is: Representative peer pairs meet approved RDMA bandwidth and latency targets repeatably.

D:

This alternative is relevant to InfiniBand link error and recovery counters but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Link errors stabilize below approved thresholds and NCCL performance recovers under repeated load. Observed scenario: An engineer relies on TCP iperf alone to certify the fabric's InfiniBand RDMA path.

Question 873

The cluster operations team needs to evaluate this situation: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration. Which operational response is MOST appropriate to address the root issue? Select ONE best answer.

  1. Run supported verbs bandwidth and latency tests across representative peers while examining physical counters.
  2. Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency.
  3. Run a controlled representative GPU stress with monitoring of temperatures, memory and power-limit behavior.
  4. Execute supported CUDA runtime initialization and minimal kernel tests on each scheduled accelerator.

Explanation

Correct Answer

A:

This is an appropriate correction for InfiniBand verbs microbenchmark bandwidth latency: Run supported verbs bandwidth and latency tests across representative peers while examining physical counters. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Incorrect Answers

B:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand verbs microbenchmark bandwidth latency: Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency. A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

C:

This alternative is relevant to GPU thermal power and memory single-node burn-in but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Run a controlled representative GPU stress with monitoring of temperatures, memory and power-limit behavior. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

D:

This alternative is relevant to CUDA device query and kernel smoke tests but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Execute supported CUDA runtime initialization and minimal kernel tests on each scheduled accelerator. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Question 874

At a multi-node AI infrastructure handoff, the team records: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration. Which underlying infrastructure principle BEST explains the issue? Select ONE best answer.

  1. Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency.
  2. RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools.
  3. An active port can experience transient physical errors and recovery that degrade high-performance collectives.
  4. DCGM diagnostic suites exercise hardware and software health more deeply than passive status queries, sometimes consuming substantial resources.

Explanation

Correct Answer

B:

This is the governing infrastructure principle: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Incorrect Answers

A:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand verbs microbenchmark bandwidth latency: Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency. A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration. RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools.

C:

That option concerns InfiniBand link error and recovery counters. The proportionate action is: Run supported verbs bandwidth and latency tests across representative peers while examining physical counters.

D:

This alternative is relevant to DCGM active single-node diagnostic suites but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: DCGM diagnostic suites exercise hardware and software health more deeply than passive status queries, sometimes consuming substantial resources. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Question 875

During an NVIDIA AI factory acceptance test, engineers discover: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency.
  2. Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters.
  3. Inspect GPU idle gaps, dataset read throughput, NIC utilization, storage counters and per-job I/O patterns.
  4. Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information.

Explanation

Correct Answer

B:

This is the direct operational evidence to investigate: Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Incorrect Answers

A:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand verbs microbenchmark bandwidth latency: Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration. The governing mechanism is: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools. The proportionate action is: Run supported verbs bandwidth and latency tests across representative peers while examining physical counters.

C:

This alternative is relevant to Storage streaming bandwidth under GPU load but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Inspect GPU idle gaps, dataset read throughput, NIC utilization, storage counters and per-job I/O patterns. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

D:

This alternative is relevant to InfiniBand subnet manager and route distribution but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Question 876

A production GPU cluster review identifies this condition: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration. After corrective work, which observable result BEST confirms that the requirement is met? Select ONE best answer.

  1. Representative peer pairs meet approved RDMA bandwidth and latency targets repeatably.
  2. All required HCA links are Active with valid fabric membership and can reach intended peer endpoints.
  3. Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency.
  4. Each intended GPU successfully initializes and executes a minimal repeatable CUDA workload under its supported stack.

Explanation

Correct Answer

A:

This is an observable verified result, not merely a claimed configuration change: Representative peer pairs meet approved RDMA bandwidth and latency targets repeatably. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Incorrect Answers

B:

This alternative is relevant to InfiniBand link state LID and physical activation but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: All required HCA links are Active with valid fabric membership and can reach intended peer endpoints. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

C:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand verbs microbenchmark bandwidth latency: Treat a successful host TCP ping test as equivalent to verified InfiniBand verbs throughput and latency. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration. The governing mechanism is: RDMA verbs benchmarks reveal transport behavior not fully measured by ordinary TCP connectivity tools. The proportionate action is: Run supported verbs bandwidth and latency tests across representative peers while examining physical counters. A direct check is: Inspect ib_write_bw or ib_write_lat output, MTU, negotiated link speed and HCA or switch counters. The acceptance condition is: Representative peer pairs meet approved RDMA bandwidth and latency targets repeatably.

D:

This alternative is relevant to CUDA device query and kernel smoke tests but does not directly resolve the current InfiniBand verbs microbenchmark bandwidth latency issue: Each intended GPU successfully initializes and executes a minimal repeatable CUDA workload under its supported stack. Observed scenario: A multi-node pod has asymmetric ib_write_bw results due to one degraded cable or HCA configuration.

Question 877

In a professional AI infrastructure deployment, a technician observes: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move. Which operational response is MOST appropriate to address the root issue? Select ONE best answer.

  1. Correlate cumulative and rate-based InfiniBand link counters with workloads and replace defective physical paths as indicated.
  2. Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing.
  3. Assume that any InfiniBand port in Active state must have zero physical faults or recovery events.
  4. Execute supported CUDA runtime initialization and minimal kernel tests on each scheduled accelerator.

Explanation

Correct Answer

A:

This is an appropriate correction for InfiniBand link error and recovery counters: Correlate cumulative and rate-based InfiniBand link counters with workloads and replace defective physical paths as indicated. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

Incorrect Answers

B:

This alternative is relevant to Transceiver firmware and negotiated link test but does not directly resolve the current InfiniBand link error and recovery counters issue: Check transceiver identity, firmware and supported FEC or link settings at both ends before stress testing. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

C:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand link error and recovery counters: Assume that any InfiniBand port in Active state must have zero physical faults or recovery events.

D:

This alternative is relevant to CUDA device query and kernel smoke tests but does not directly resolve the current InfiniBand link error and recovery counters issue: Execute supported CUDA runtime initialization and minimal kernel tests on each scheduled accelerator. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

Question 878

The cluster operations team needs to evaluate this situation: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move. Which underlying infrastructure principle BEST explains the issue? Select ONE best answer.

  1. Sustained accelerator load can reveal thermal and electrical limits not visible during idle or brief smoke checks.
  2. Device enumeration through management utilities does not independently prove CUDA execution or user-space compatibility.
  3. An active port can experience transient physical errors and recovery that degrade high-performance collectives.
  4. Assume that any InfiniBand port in Active state must have zero physical faults or recovery events.

Explanation

Correct Answer

C:

This is the governing infrastructure principle: An active port can experience transient physical errors and recovery that degrade high-performance collectives. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

Incorrect Answers

A:

This alternative is relevant to GPU thermal power and memory single-node burn-in but does not directly resolve the current InfiniBand link error and recovery counters issue: Sustained accelerator load can reveal thermal and electrical limits not visible during idle or brief smoke checks. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

B:

That option concerns CUDA device query and kernel smoke tests. The proportionate action is: Correlate cumulative and rate-based InfiniBand link counters with workloads and replace defective physical paths as indicated.

D:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand link error and recovery counters: Assume that any InfiniBand port in Active state must have zero physical faults or recovery events. An active port can experience transient physical errors and recovery that degrade high-performance collectives.

Question 879

At a multi-node AI infrastructure handoff, the team records: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Inspect HPL configuration, problem size, process grid, elapsed time, residual report and resource mapping.
  2. Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history.
  3. Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs.
  4. Assume that any InfiniBand port in Active state must have zero physical faults or recovery events.

Explanation

Correct Answer

B:

This is the direct operational evidence to investigate: Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

Incorrect Answers

A:

That option concerns HPL configuration matrix dimensions and performance. An active port can experience transient physical errors and recovery that degrade high-performance collectives.

C:

This alternative is relevant to InfiniBand link state LID and physical activation but does not directly resolve the current InfiniBand link error and recovery counters issue: Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

D:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand link error and recovery counters: Assume that any InfiniBand port in Active state must have zero physical faults or recovery events. A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

Question 880

During an NVIDIA AI factory acceptance test, engineers discover: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move. Which TWO complementary elements are needed: the correct technical action and the strongest independent diagnostic evidence? Select TWO answers.

  1. Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history.
  2. Correlate cumulative and rate-based InfiniBand link counters with workloads and replace defective physical paths as indicated.
  3. Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters.
  4. Assume that any InfiniBand port in Active state must have zero physical faults or recovery events.
  5. Capture a reproducible preflight inventory of node hardware, software, connections and expected acceptance tests.

Explanation

Correct Answers

A:

This is the direct operational evidence to investigate: Inspect symbol error, link recovery, port receive errors, timestamps, neighboring port counters and cable history. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move. The governing mechanism is: An active port can experience transient physical errors and recovery that degrade high-performance collectives.

B:

This is an appropriate correction for InfiniBand link error and recovery counters: Correlate cumulative and rate-based InfiniBand link counters with workloads and replace defective physical paths as indicated. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move. The governing mechanism is: An active port can experience transient physical errors and recovery that degrade high-performance collectives.

Incorrect Answers

C:

This alternative is relevant to Transceiver firmware and negotiated link test but does not directly resolve the current InfiniBand link error and recovery counters issue: Inspect DOM and EEPROM inventory, switch version, link logs, negotiated speed, FEC and retrain counters. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

D:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand link error and recovery counters: Assume that any InfiniBand port in Active state must have zero physical faults or recovery events. A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move. An active port can experience transient physical errors and recovery that degrade high-performance collectives.

E:

This alternative is relevant to Cluster-wide preflight hardware inventory but does not directly resolve the current InfiniBand link error and recovery counters issue: Capture a reproducible preflight inventory of node hardware, software, connections and expected acceptance tests. Observed scenario: A high-speed fabric stays connected but link recovery events and symbol errors increase after a cable move.

NCP-AI Infrastructure (NCP-AII) Practice Tests