This is the condensed review layer for NCP-AII: the sequences, signals, and comparisons that exam questions turn on, organized by domain weight. Use it for final-week passes and as a checkpoint while studying. Full explanations live in the domains breakdown, and exam logistics in the complete guide.
Exam Quick Facts
The Deployment Sequence (Bring-up, 31%)
Memorize this as a story with checkpoints, because questions probe what must be true before each step:
- Site readiness: power budget, cooling capacity, floor loading validated per rack
- Rack and cable: physical installation, cabling against the topology map, labels
- Out-of-band management: BMC on its dedicated network, IPMI/Redfish access, TPM configuration
- Firmware alignment: BMC, BIOS, GPU, NIC, NVSwitch updated to the qualified matrix, in documented order
- OS provisioning: PXE boot from the control plane, node images applied
- Drivers and fabric software: GPU driver, container toolkit, Fabric Manager where NVSwitch is present
- Validation: burn-in, benchmarks, fabric sweep, version confirmation, then handoff
Key trap: anything managed before an OS exists happens through the BMC. Answers that touch the OS before step 5 are wrong by sequence.
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Validation Toolchain (Test & Verification, 33%)
Validation Tools by Question
| You need to... | Tool | Healthy looks like |
|---|---|---|
| Stress a single node / burn-in | dcgmi diag (escalating levels) | All tests pass at the level run |
| Prove cluster-level performance | HPL benchmark | Efficiency in line with reference architecture |
| Validate multi-node GPU communication | nccl-tests (all_reduce_perf) | Bus bandwidth in expected range, flat across sizes |
| Check NVLink health per GPU | nvidia-smi nvlink -s | All links up at expected width/speed |
| Check IB link negotiation | ibstat / ibstatus | Active width x-lanes and speed as designed |
| Sweep the whole fabric | ibdiagnet / ClusterKit | No symbol errors, no misrouted links |
| Confirm software stack | Version inventory vs qualified matrix | Zero skew across nodes |
Diagnostic patterns worth memorizing:
- NCCL bandwidth fine within a node, poor across nodes: inter-node fabric (IB/Ethernet) problem
- NCCL poor even within a node: NVLink topology or Fabric Manager problem
- HPL underperforms with healthy GPUs: usually one slow node or degraded link dragging the collective
- Climbing symbol errors on one port: marginal cable or transceiver, physical layer
Xid Quick Table (Troubleshoot, 12%)
| Xid | Meaning | Action class |
|---|---|---|
| 48 | Double-bit ECC error | Investigate memory health; drain and diagnose |
| 63 / 64 | Row remapping event (HBM) | Monitor; plan replacement if recurring |
| 79 | GPU fell off the bus | Hardware-level: reseat or replace, revalidate |
| Thermal/power events | Slowdown or power brake engaged | Check cooling, inlet temps, transient load |
DCGM complements the table: health watches for continuous monitoring, dcgmi diag levels for on-demand depth (quick software checks at low levels, long hardware diagnostics at the top). Replacement discipline: drain, confirm, replace, burn-in, revalidate, return to service.
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Control Plane Map (19%)
| Component | Role |
|---|---|
| Base Command Manager | Cluster manager: head node provisions and manages all nodes |
| Node images / categories | Image-based provisioning for fleet consistency |
| PXE boot | Network boot chain that delivers images: DHCP, TFTP, image install |
| NVIDIA container toolkit | Exposes GPUs to containers |
| NGC | NVIDIA's registry for containers, models, Helm charts (ngc CLI) |
| Slurm | Batch scheduler; GPUs scheduled via GRES; deployed by BCM |
| Fabric Manager | Manages NVSwitch fabric; required for NVLink fabric operation |
Sharing and Physical Layer (5%)
MIG vs vGPU vs Time-Slicing
| Property | MIG | vGPU | Time-slicing |
|---|---|---|---|
| Isolation | Hardware-partitioned instances | Software-mediated, licensed profiles | None (shared context) |
| Granularity | Up to 7 instances per GPU (e.g. 1g.10gb) | Per-profile framebuffer split | Arbitrary pod counts |
| QoS predictability | Strong (dedicated slices) | Medium | Weak |
| Reconfiguration | GPU must be idle | VM-level | Scheduler-level |
| Best for | Multi-tenant inference, hard isolation | VDI, workstations | Bursty dev/test |
BlueField DPU modes: DPU mode (Arm cores own the NIC and run infrastructure services) versus NIC mode (acts as a standard adapter). Exam angle: which mode fits which offload scenario.
Ten Facts Worth Cold Recall
- Validation is judged against the reference architecture, so "matches reference efficiency" beats any absolute number
- BMC configuration precedes everything OS-related, always
- Firmware updates follow the qualified matrix and order, never piecemeal latest-everything
all_reduce_perfbus bandwidth is the standard multi-node communication check- Version skew across nodes is a first-class failure cause in validation scenarios
- Xid 79 means hardware attention, no software fix
- MIG reconfiguration requires an idle GPU
- Fabric Manager must run on NVSwitch systems for NVLink fabric mode
- Compute fabric is non-blocking; management and storage networks may be oversubscribed
- NGC is the source for qualified containers; the container toolkit is what exposes GPUs to them
Final-Week Usage
Run the sheet top to bottom, mark what produces hesitation, take a timed practice exam, and compare misses against the marks. Repeat until the sheet holds no surprises. Preporato's NCP-AII practice exams provide the measurement half: 7 full-length tests, 455 explained questions, per-domain scoring aligned to the same weights this sheet follows. For sitting strategy, finish with the first-attempt guide.
Sources:
- NVIDIA NCP-AII Official Certification Page
- NVIDIA DGX Platform Documentation
- NVIDIA DCGM Documentation
Last updated: July 9, 2026
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