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NEW QUESTION # 142
An engineer is tasked with configuring Out-of-Band management for a DGX BasePOD deployment. Which network design will best ensure secure and reliable Out-of-Band management operations?
Answer: C
Explanation:
The best design is to place all BMC and management interfaces on an isolated Out-of-Band network with access restricted by firewall rules. Out-of-Band management provides administrative access for hardware monitoring, remote console, power operations, firmware maintenance, and recovery actions even when the host operating system or production network is unavailable. Because BMC interfaces are powerful administrative control points, they should not share the same network as user traffic or the high-performance compute fabric. NVIDIA DGX guidance recommends restricting IPMI or BMC ports to an isolated, dedicated management network, using a separate firewalled subnet, or using a separate VLAN for BMC traffic when a dedicated network is unavailable. Allowing access from any subnet increases the attack surface and weakens operational security. Sharing the same switch or VLAN as production traffic can also expose management interfaces to congestion or unauthorized access. A dedicated OOB network improves security, reliability, and serviceability for DGX BasePOD operations.
NEW QUESTION # 143
After a firmware upgrade on a DGX H100, the administrator notices that one GPU is not detected by the system. Which troubleshooting step should be performed first to identify the root cause?
Answer: D
Explanation:
The first step is to review the firmware update logs and run nvsm show health. After a DGX H100 firmware upgrade, a missing GPU can result from incomplete firmware activation, failed component update, PCIe enumeration failure, GPU tray communication issues, BMC inventory mismatch, or an actual hardware fault.
NVSM is the correct DGX platform-level health tool because it checks hardware state across GPUs, NVSwitch components, PCIe devices, storage, power, cooling, and system sensors. Firmware logs are equally important because they show whether each update completed successfully and whether a reboot, cold power cycle, BMC reset, or AC power cycle is still required. Replacing the GPU immediately is premature and may cause unnecessary downtime. Ignoring the issue is unsafe because production AI workloads expect all GPUs to be visible and healthy. Re-running firmware across all components without diagnosis can hide the original failure or introduce more risk. Proper bring-up practice is to collect evidence, verify hardware health, confirm firmware activation state, and then decide whether reseating, power cycling, reapplying firmware, or service escalation is required.
NEW QUESTION # 144
An administrator is configuring node categories in BCM for a DGX BasePOD cluster. They need to group all NVIDIA DGX H200 nodes under a dedicated category for GPU-accelerated workloads. Which approach aligns with NVIDIA's recommended BCM practices?
Answer: B
Explanation:
NVIDIA Base Command Manager (BCM) uses "Categories" as the primary organizational unit for applying configurations, software images, and security policies to groups of nodes. In a heterogeneous cluster-or even a large homogeneous one-creating specific categories for different hardware generations (like DGX H100 vs. H200) is a best practice. By creating a dedicated dgx-h200 category (Option B), the administrator can apply specific kernel parameters, driver versions, and specialized software packages (like specific versions of the NVIDIA Container Toolkit or DOCA) that are optimized for the H200's HBM3e memory and Hopper architecture updates. Using a generic dgxnodes category (Option C) makes it difficult to perform rolling upgrades or test new drivers on a subset of hardware without impacting the entire cluster. Furthermore, categorizing nodes allows for more granular integration with the Slurm workload manager, enabling users to target specific hardware features via partition definitions that map directly to these BCM categories. This modular approach reduces "configuration drift" and ensures that the AI factory remains manageable as it scales from a single POD to a multi-POD SuperPOD architecture.
NEW QUESTION # 145
Which of the following steps are essential components of a recommended DGX cluster installation procedure?
Pick the 2 correct responses below.
Answer: A,D
Explanation:
The correct essential steps are grouping nodes by function and validating networking on every node. In DGX cluster deployments, nodes are commonly organized by role, such as head nodes, compute nodes, login nodes, storage nodes, or management components. Cluster management tools such as NVIDIA Base Command Manager use these logical groupings or categories to apply software images, configurations, monitoring, and operational actions consistently. NVIDIA DGX SuperPOD documentation describes cluster manager concepts where devices represent components such as head nodes, physical nodes, switches, and PDUs, and older DGX SuperPOD guidance references default BCM node categories for login and compute systems. Network validation is equally important before higher-level software deployment because InfiniBand, Ethernet, management, and storage interfaces must be correctly cabled, addressed, and reachable. Installing Slurm before compute node images are correctly prepared reverses the expected foundation-first workflow. Skipping node health or storage validation is unsafe because distributed workloads depend on consistent GPU health, network reachability, and storage access. A reliable DGX cluster installation starts with structured node roles, validated networks, consistent images, and then workload orchestration and application testing.
NEW QUESTION # 146
During cluster deployment, the UFM Cable Validation Tool reports "Wrong-neighbor" errors on multiple InfiniBand links. What is the most efficient way to resolve this issue?
Answer: C
Explanation:
In large-scale InfiniBand fabrics, such as those in NVIDIA DGX SuperPODs, maintaining an exact cabling topology is mandatory for theAdaptive RoutingandFat-Treealgorithms to function correctly. A "Wrong- neighbor" error occurs when the Unified Fabric Manager (UFM) detects that a cable is connected to a port other than the one specified in the master topology map (often a .csv or .topology file). UFM uses LLDP (Link Layer Discovery Protocol) or Subnet Management packets to identify the GUIDs on both ends of a link.
The most efficient remediation is to cross-reference the live LLDP data provided by UFM with the intended design. This allows the engineer to identify if the error is a physical mis-cabling (swapped ports) or a logical error in the topology file. Rebooting switches (Option A) will not fix a physical patch error, and disabling FEC (Option D) would lead to catastrophic signal loss on 400G (NDR) links without addressing the underlying routing logic issue. Correcting the physical patch or updating the topology file ensures the fabric's
"Ground Truth" is restored.
NEW QUESTION # 147
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