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NVIDIA NCP-AII Practice Test 86

Question 850

During an NVIDIA AI factory acceptance test, engineers discover: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. Which TWO complementary elements are needed: the correct technical action and the strongest independent diagnostic evidence? Select TWO answers.

  1. Inspect node inventory, GPU and NIC UUIDs, firmware and driver versions, cabling records and test eligibility.
  2. Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs.
  3. Schedule supported active DCGM diagnostics for the relevant GPU class and investigate detailed failures.
  4. Equate an InfiniBand PCIe device in lspci with a usable active subnet connection.
  5. Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability.

Explanation

Correct Answers

B:

This is the direct operational evidence to investigate: Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists.

E:

This is an appropriate correction for InfiniBand link state LID and physical activation: Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. The governing mechanism is: An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup.

Incorrect Answers

A:

This alternative is relevant to Cluster-wide preflight hardware inventory but does not directly resolve the current InfiniBand link state LID and physical activation issue: Inspect node inventory, GPU and NIC UUIDs, firmware and driver versions, cabling records and test eligibility. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists.

C:

That option concerns DCGM active single-node diagnostic suites. An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup.

D:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand link state LID and physical activation: Equate an InfiniBand PCIe device in lspci with a usable active subnet connection. A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup.

Question 851

A production GPU cluster review identifies this condition: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Inspect cable IDs, neighbor advertisements, switch port inventory and approved topology drawing.
  2. Equate an InfiniBand PCIe device in lspci with a usable active subnet connection.
  3. Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs.
  4. Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information.

Explanation

Correct Answer

C:

This is the direct operational evidence to investigate: Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. The governing mechanism is: An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup.

Incorrect Answers

A:

This alternative is relevant to Cable topology mapping with LLDP and physical records but does not directly resolve the current InfiniBand link state LID and physical activation issue: Inspect cable IDs, neighbor advertisements, switch port inventory and approved topology drawing. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists.

B:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand link state LID and physical activation: Equate an InfiniBand PCIe device in lspci with a usable active subnet connection. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. The governing mechanism is: An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup. The proportionate action is: Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability.

D:

This alternative is relevant to InfiniBand subnet manager and route distribution but does not directly resolve the current InfiniBand link state LID and physical activation issue: Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists.

Question 852

In a professional AI infrastructure deployment, a technician observes: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. After corrective work, which observable result BEST confirms that the requirement is met? Select ONE best answer.

  1. Equate an InfiniBand PCIe device in lspci with a usable active subnet connection.
  2. Link errors stabilize below approved thresholds and NCCL performance recovers under repeated load.
  3. All required HCA links are Active with valid fabric membership and can reach intended peer endpoints.
  4. Every intended host and switch port reaches the correct physical peer with documented redundant paths.

Explanation

Correct Answer

C:

This is an observable verified result, not merely a claimed configuration change: All required HCA links are Active with valid fabric membership and can reach intended peer endpoints. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists.

Incorrect Answers

A:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand link state LID and physical activation: Equate an InfiniBand PCIe device in lspci with a usable active subnet connection. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists. The governing mechanism is: An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup. The proportionate action is: Confirm InfiniBand physical and logical port states, subnet assignment and end-to-end reachability. A direct check is: Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs. The acceptance condition is: All required HCA links are Active with valid fabric membership and can reach intended peer endpoints.

B:

This alternative is relevant to InfiniBand link error and recovery counters but does not directly resolve the current InfiniBand link state LID and physical activation issue: Link errors stabilize below approved thresholds and NCCL performance recovers under repeated load. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists.

D:

This alternative is relevant to Cable topology mapping with LLDP and physical records but does not directly resolve the current InfiniBand link state LID and physical activation issue: Every intended host and switch port reaches the correct physical peer with documented redundant paths. Observed scenario: A technician starts training when a leaf switch port is physically disconnected although the OS interface exists.

Question 853

The cluster operations team needs to evaluate this situation: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active. Which operational response is MOST appropriate to address the root issue? Select ONE best answer.

  1. Configure a supported active subnet manager and validated standby behavior with consistent fabric policy.
  2. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.
  3. Execute supported CUDA runtime initialization and minimal kernel tests on each scheduled accelerator.
  4. Correlate cumulative and rate-based InfiniBand link counters with workloads and replace defective physical paths as indicated.

Explanation

Correct Answer

A:

This is an appropriate correction for InfiniBand subnet manager and route distribution: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Incorrect Answers

B:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.

C:

This alternative is relevant to CUDA device query and kernel smoke tests but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Execute supported CUDA runtime initialization and minimal kernel tests on each scheduled accelerator. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

D:

This alternative is relevant to InfiniBand link error and recovery counters but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Correlate cumulative and rate-based InfiniBand link counters with workloads and replace defective physical paths as indicated. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Question 854

At a multi-node AI infrastructure handoff, the team records: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active. Which underlying infrastructure principle BEST explains the issue? Select ONE best answer.

  1. InfiniBand requires subnet management for address assignment and routing across the switched fabric.
  2. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.
  3. HPL measures achieved dense linear-algebra throughput under a specific matrix and process mapping, not marketing peak clocks.
  4. A representative performance benchmark is meaningful only when the tested hardware and software baseline are documented.

Explanation

Correct Answer

A:

This is the governing infrastructure principle: InfiniBand requires subnet management for address assignment and routing across the switched fabric. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Incorrect Answers

B:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub. InfiniBand requires subnet management for address assignment and routing across the switched fabric.

C:

That option concerns HPL configuration matrix dimensions and performance. The proportionate action is: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy.

D:

This alternative is relevant to Cluster-wide preflight hardware inventory but does not directly resolve the current InfiniBand subnet manager and route distribution issue: A representative performance benchmark is meaningful only when the tested hardware and software baseline are documented. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Question 855

During an NVIDIA AI factory acceptance test, engineers discover: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Inspect HPL output for residual tests, return codes, numerical anomalies and rerun consistency.
  2. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.
  3. Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs.
  4. Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information.

Explanation

Correct Answer

D:

This is the direct operational evidence to investigate: Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Incorrect Answers

A:

This alternative is relevant to HPL numerical result and residual validation but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Inspect HPL output for residual tests, return codes, numerical anomalies and rerun consistency. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

B:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub. Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

C:

This alternative is relevant to InfiniBand link state LID and physical activation but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Inspect ibstat or equivalent device output, port state, LID, switch interface and subnet-manager logs. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Question 856

A production GPU cluster review identifies this condition: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active. After corrective work, which observable result BEST confirms that the requirement is met? Select ONE best answer.

  1. Each intended GPU successfully initializes and executes a minimal repeatable CUDA workload under its supported stack.
  2. New and existing ports become correctly addressed and end-to-end fabric paths work after manager failover.
  3. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.
  4. All required HCA links are Active with valid fabric membership and can reach intended peer endpoints.

Explanation

Correct Answer

B:

This is an observable verified result, not merely a claimed configuration change: New and existing ports become correctly addressed and end-to-end fabric paths work after manager failover. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Incorrect Answers

A:

This alternative is relevant to CUDA device query and kernel smoke tests but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Each intended GPU successfully initializes and executes a minimal repeatable CUDA workload under its supported stack. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

C:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub. Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active. InfiniBand requires subnet management for address assignment and routing across the switched fabric.

D:

This alternative is relevant to InfiniBand link state LID and physical activation but does not directly resolve the current InfiniBand subnet manager and route distribution issue: All required HCA links are Active with valid fabric membership and can reach intended peer endpoints. Observed scenario: Multiple InfiniBand switches are cabled but host LIDs remain unassigned because no subnet manager is active.

Question 857

In a professional AI infrastructure deployment, a technician observes: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. Which operational response is MOST appropriate to address the root issue? Select ONE best answer.

  1. Run a controlled representative GPU stress with monitoring of temperatures, memory and power-limit behavior.
  2. Configure a supported active subnet manager and validated standby behavior with consistent fabric policy.
  3. Select a representative supported HPL problem size and process layout, then report achieved and reference performance honestly.
  4. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.

Explanation

Correct Answer

B:

This is an appropriate correction for InfiniBand subnet manager and route distribution: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

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 subnet manager and route distribution issue: Run a controlled representative GPU stress with monitoring of temperatures, memory and power-limit behavior. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

C:

This alternative is relevant to HPL configuration matrix dimensions and performance but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Select a representative supported HPL problem size and process layout, then report achieved and reference performance honestly. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

D:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub. A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

Question 858

The cluster operations team needs to evaluate this situation: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. Which underlying infrastructure principle BEST explains the issue? Select ONE best answer.

  1. An active port can experience transient physical errors and recovery that degrade high-performance collectives.
  2. An enumerated HCA does not imply a fabric-ready port; InfiniBand state and LID assignment reflect additional setup.
  3. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.
  4. InfiniBand requires subnet management for address assignment and routing across the switched fabric.

Explanation

Correct Answer

D:

This is the governing infrastructure principle: InfiniBand requires subnet management for address assignment and routing across the switched fabric. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

Incorrect Answers

A:

That option concerns InfiniBand link error and recovery counters. The proportionate action is: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy.

B:

That option concerns InfiniBand link state LID and physical activation. The proportionate action is: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy.

C:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub. A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. InfiniBand requires subnet management for address assignment and routing across the switched fabric.

Question 859

At a multi-node AI infrastructure handoff, the team records: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. Which diagnostic evidence should be obtained FIRST to substantiate the likely fault or configuration gap? Select ONE best answer.

  1. Inspect deviceQuery or equivalent CUDA sample output, driver-runtime versions and kernel launch error codes.
  2. Inspect node inventory, GPU and NIC UUIDs, firmware and driver versions, cabling records and test eligibility.
  3. Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information.
  4. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.

Explanation

Correct Answer

C:

This is the direct operational evidence to investigate: Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

Incorrect Answers

A:

This alternative is relevant to CUDA device query and kernel smoke tests but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Inspect deviceQuery or equivalent CUDA sample output, driver-runtime versions and kernel launch error codes. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

B:

That option concerns Cluster-wide preflight hardware inventory. InfiniBand requires subnet management for address assignment and routing across the switched fabric.

D:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. The governing mechanism is: InfiniBand requires subnet management for address assignment and routing across the switched fabric. The proportionate action is: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy.

Question 860

During an NVIDIA AI factory acceptance test, engineers discover: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. Which TWO complementary elements are needed: the correct technical action and the strongest independent diagnostic evidence? Select TWO answers.

  1. Schedule supported active DCGM diagnostics for the relevant GPU class and investigate detailed failures.
  2. Configure a supported active subnet manager and validated standby behavior with consistent fabric policy.
  3. Inspect HPL output for residual tests, return codes, numerical anomalies and rerun consistency.
  4. Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information.
  5. Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub.

Explanation

Correct Answers

B:

This is an appropriate correction for InfiniBand subnet manager and route distribution: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. The governing mechanism is: InfiniBand requires subnet management for address assignment and routing across the switched fabric.

D:

This is the direct operational evidence to investigate: Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. The governing mechanism is: InfiniBand requires subnet management for address assignment and routing across the switched fabric.

Incorrect Answers

A:

This alternative is relevant to DCGM active single-node diagnostic suites but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Schedule supported active DCGM diagnostics for the relevant GPU class and investigate detailed failures. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

C:

This alternative is relevant to HPL numerical result and residual validation but does not directly resolve the current InfiniBand subnet manager and route distribution issue: Inspect HPL output for residual tests, return codes, numerical anomalies and rerun consistency. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage.

E:

This tempting but unsafe shortcut is not a sufficient remediation for InfiniBand subnet manager and route distribution: Assume unmanaged InfiniBand switches independently assign all LIDs and routes just like an ordinary Ethernet hub. Observed scenario: A fabric has conflicting subnet managers and route/path behavior becomes unstable after a controller outage. The governing mechanism is: InfiniBand requires subnet management for address assignment and routing across the switched fabric. The proportionate action is: Configure a supported active subnet manager and validated standby behavior with consistent fabric policy. A direct check is: Inspect subnet-manager state, LIDs, partition policy, discovered topology and routing information. The acceptance condition is: New and existing ports become correctly addressed and end-to-end fabric paths work after manager failover.

NCP-AI Infrastructure (NCP-AII) Practice Tests