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| Section | Weight | Objectives |
|---|---|---|
| System and Server Bring-up | 20% | - Hardware installation and validation
|
| Software Stack Deployment | 25% | - Orchestration and workload management
|
| GPU Resource Management | 15% | - GPU scheduling and optimization
|
| Networking and Storage Configuration | 20% | - Storage integration
|
| Validation, Troubleshooting and Optimization | 20% | - Troubleshooting and maintenance
|
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NEW QUESTION # 164
A DGX H100 system shows intermittent "Link Down" errors on a 200G DAC cable. CVT reports "No Signal" despite physical connection. What is the first hardware check?
Answer: B
Explanation:
The first hardware check should be cable compatibility and connector inspection. A "No Signal" result from the Cable Validation Tool indicates that the physical layer is not establishing a usable signal, even though the cable appears to be inserted. In DGX H100 and NVIDIA high-speed networking environments, DAC cables must be validated for the correct speed, adapter generation, switch platform, firmware compatibility, and physical form factor. A damaged connector, unsupported cable, poorly seated latch, excessive bend radius, or wrong cable type can cause intermittent "Link Down" events. Replacing an optical transceiver is not appropriate because the issue is on a DAC connection, not an optical link. Reconfiguring the port to 100G may mask the failure but does not validate the required 200G operation. Upgrading all switches for RS-FEC is too broad and does not address a local "No Signal" condition. Proper physical-layer bring-up requires confirming the cable is supported, visually inspecting both ends, reseating it, and checking whether the link comes up cleanly before moving to firmware or switch-level troubleshooting.
NEW QUESTION # 165
You are running a large-scale distributed training job on a cluster of AMD EPYC servers, each equipped with multiple NVIDIAA100 GPUs. You are using Slurm for job scheduling. The training process often fails with NCCL errors related to network connectivity. What steps can you take to improve the reliability of the network communication for NCCL in this environment? Choose the MOST appropriate answers.
Answer: A,D,E
Explanation:
Ensuring network configuration is correct is the most important step. 'srun' with '-mpi=pmi2 handles NCCL environment variable setup by Slurm automatically for proper connectivity. Increasing timeouts allows for transient network issues to resolve without causing failures. Disabling the firewall is a security risk. Decreasing the batch size will reduce the amount of data but won't fix the core network connectivity issues.
NEW QUESTION # 166
A customer has just completed the first boot of their DGX system and is prompted to create an administrative user. What is the correct approach for setting up this user to ensure secure BMC and GRUB access?
Answer: C
Explanation:
During the initial "first boot" setup of an NVIDIA DGX system (such as the DGX H100 or A100), the installation wizard requires the creation of a primary administrative user. This account is pivotal because it is used not only for local OS login but is also synchronized to provide access to the Baseboard Management Controller (BMC) and the GRUB bootloader. NVIDIA best practices emphasize security by mandating the use of a unique, strong password. Using a lower-case username is a standard Linux convention that ensures compatibility across various authentication services. By setting this up correctly during the first boot, the system ensures that "out-of-band" management (via BMC) and "pre-boot" configuration (via GRUB) are protected from unauthorized access. Relying on default credentials (Option B) or weak passwords (Option D) is a significant security risk in AI infrastructure, as the BMC often has high-level control over power, firmware, and remote console access.
NEW QUESTION # 167
As the infrastructure lead for an NVIDIA AI Factory deployment, you have just uploaded the latest supported firmware packages to your DGX system. It is now critical to ensure all hardware components run the new firmware and the DGX returns to full operational capability. Which sequence best guarantees that all relevant components are correctly running updated firmware?
Answer: C
Explanation:
Updating an NVIDIA DGX system (like the H100) is a multi-layered process because the system contains numerous programmable logic devices, including CPLDs, FPGAs, and the EROT (Electrically Resilient Root of Trust) modules. Many of these low-level hardware components cannot be updated via a simple operating system reboot. NVIDIA's official firmware update procedure requires a specific sequence to "commit" the new images to the hardware. First, the update utility (like nvfwupd) writes the images to the flash memory. To activate them, a "Cold Power Cycle" (removing and restoring power) is necessary to force the hardware to reload from the newly written flash blocks. Furthermore, because the BMC (Baseboard Management Controller) orchestrates the power-on sequence and monitors the EROT, it must be reset (Option D) to synchronize its state with the new component versions. Finally, an "AC Power Cycle" ensures that even the standby-power components, such as the power delivery controllers and CPLDs, undergo a full hardware reset.
Skipping these steps can result in "Incomplete" or "Mismatched" firmware versions, where the OS reports one version while the hardware continues to run old, potentially buggy code in the background.
NEW QUESTION # 168
A system engineer needs to set the vGPU scheduling behavior for all GPUs to share the scheduling equally with the default time slice length. What command should be used?
Answer: D
Explanation:
The RmPVMRL=0x00 setting configures the NVIDIA vGPU scheduler to use equal-share scheduling with the default time slice length. The esxcli system module parameters set -m nvidia command is the correct ESXi command format for setting NVIDIA kernel module parameters globally for the GPUs.
NEW QUESTION # 169
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