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NEW QUESTION # 34
You are validating the environment of an NVIDIA GPU-accelerated data center during post-deployment checks. Which one action is essential to confirm that power and cooling are sufficient for the stable operation of NVIDIA DGX H100 systems?
Answer: D
Explanation:
Stable operation of high-density AI infrastructure like the DGX H100 requires strict adherence to power and thermal specifications. A single DGX H100 system can draw up to10.2kWunder peak load. Therefore, the most essential validation step is ensuring the electrical "infrastructure-to-server" handoff is healthy. This involves verifying that the system is connected to redundant PDUs (Power Distribution Units) capable of handling the amperage requirements without tripping breakers. UsingNVSM (NVIDIA System Management), an administrator must check that all six power supplies (PSUs) are functional and receiving nominal input voltage (typically 200V-240V). If a PSU reports sub-optimal input or a "Loss of Redundancy," the system may throttle performance or shut down unexpectedly during a heavy training run. Fans running at
100% (Option A) at all times would actually indicate an inefficient or failed cooling policy, as fans should dynamically scale based on thermals. Overclocking (Option B) is not supported or recommended for enterprise DGX systems, as they are already factory-tuned for the highest stable performance.
NEW QUESTION # 35
A system administrator receives an alert about a potential hardware fault on an NVIDIA DGX A100. The GPU performance seems degraded, and the system fans are operating loudly. What step should be recommended to identify and troubleshoot the hardware fault?
Answer: D
Explanation:
When a DGX system exhibits high fan speeds and performance degradation, it is typically engaging in Thermal Throttling. High-performance GPUs like the A100 or H100 will automatically reduce their clock speeds (and thus performance) if they exceed safe temperature thresholds. The first and most critical diagnostic step is to run nvidia-smi. This utility provides immediate, real-time telemetry on GPU temperatures, power draw, and "Clocks Throttle Reasons." By reviewing the output, an administrator can see if "Thermal" is listed as the reason for reduced clocks. This identifies whether the issue is environmental (blocked airflow/hot aisle temperature) or hardware-specific (a failed GPU thermal interface or a dead internal fan). Running more workloads (Option A) would exacerbate the heat, while a power drain (Option C) is a
"last resort" that doesn't provide diagnostic data. nvidia-smi provides the evidentiary data needed to determine if an RMA (Return Merchandise Authorization) is required for the GPU tray.
NEW QUESTION # 36
ClusterKit's NCCL bandwidth test shows 350 GB/s on a 400G InfiniBand fabric. How should this result be interpreted?
Answer: B
Explanation:
A 350 GB/s NCCL bandwidth result on a 400G InfiniBand fabric indicates strong collective communication performance. This is consistent with a healthy fabric and effective GPUDirect RDMA operation during ClusterKit validation.
NEW QUESTION # 37
You are a network administrator responsible for configuring an East-West (E/W) Spectrum-X fabric using SuperNIC. The Bluefield-3 devices in your network should be set to NIC mode with RoCE enabled to optimize data flow between servers. You have access to the Spectrum-X management tools and the necessary documentation. You need to use specific configuration commands to achieve this setup. Which of the following steps and commands are necessary to configure the Bluefield-3 devices in NIC mode for the E/W Spectrum-X fabric using SuperNIC? (Pick the 2 correct responses below)
Answer: B,C
Explanation:
NVIDIA Spectrum-X is the world's first high-performance Ethernet fabric designed specifically for AI, combining Spectrum-4 switches with BlueField-3 SuperNICs. To achieve the high-throughput, low-latency requirements of East-West (server-to-server) AI traffic, the BlueField-3 hardware must be correctly provisioned. The first requirement is ensuring the physical ports are operating in Ethernet mode; LINK_TYPE_P1=2 (and P2=2 for the second port) toggles the hardware from InfiniBand to Ethernet mode.
Secondly, the BlueField-3 can operate in several "modes." While "DPU mode" (Option D) offloads the entire OS to the ARM cores, "NIC mode" (or SuperNIC mode) allows the host to manage the networking while leveraging theInternal CPU Offload Engine. Setting INTERNAL_CPU_OFFLOAD_ENGINE=1 is a specific configuration step for Spectrum-X that allows the SuperNIC to handle RoCE (RDMA over Converged Ethernet) and Congestion Control (CC) algorithms more efficiently at 400G speeds. This setup is vital for AI workloads like LLM training, where consistent latency and zero-packet-loss are non-negotiable for collective communications.
NEW QUESTION # 38
An infrastructure engineer runs a NCCL burn-in on an eight-node GPU cluster. Over a 12-hour period, all GPUs are tested with repeated all-reduce collectives. Monitoring tools show the following observations:
- Aggregate bandwidth remains within 5% of documented reference for the hardware on every run.
- No errors or timeouts are reported in NCCL logs.
- On three occasions, one GPU logged single-run bandwidth dips of 15-
20% compared to its norm, but performance recovered on the next run and stayed stable afterward. System logs show no hardware or drive errors.
- Two minor NCCL WARN-level messages about "unexpected latency spike"
appear in system logs for separate nodes, but could not be reproduced.
Which conclusion is the best strategy before releasing the cluster to production?
Answer: A
Explanation:
The cluster meets the documented bandwidth target consistently, NCCL reports no persistent errors or timeouts, and the observed bandwidth dips and WARN messages were transient and unreproducible. With stable repeated burn-in results and no supporting hardware or system-log faults, the cluster can proceed to production while continuing normal monitoring.
NEW QUESTION # 39
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