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NVIDIA AI Infrastructure Sample Questions:
1. You are tasked with installing a DGX A100 server. After racking and connecting power and network cables, you power it on, but the BMC (Baseboard Management Controller) is not accessible via the network. You have verified the network cable is connected and the switch port is active. What are the MOST likely causes and initial troubleshooting steps you should take?
A) The BMC is not powered on because the main power supply is faulty. Verify the power supply LEDs are lit and providing power to the system.
B) The BMC firmware is corrupted and needs to be reflashed using a USB drive. Check the DGX support site for the latest BMC firmware.
C) The BMC is faulty and needs to be replaced. Contact NVIDIA support for RMA.
D) The network switch port is not configured for the correct VLAN. Verify the switch port configuration to ensure it is on the same VLAN as the BMC.
E) The BMC IP address is not configured or is on a different subnet. Check the BMC's network configuration using the DGX's front panel or via serial console. Verify DHCP is enabled and functioning or manually configure a static IP address.
2. You are evaluating different parallel file systems for an AI training cluster. You need a file system that supports POSIX compliance and offers high bandwidth and low latency. Which of the following options are viable candidates?
A) BeeGFS
B) Lustre
C) Ceph
D) GiusterFS
E) NFS
3. You suspect a faulty NVIDIA ConnectX-6 network adapter in a server used for RDMA-based distributed training. Which commands or tools can you use to diagnose potential issues with the adapter's hardware and connectivity?
A) ping to test basic network connectivity.
B) nvsmimonitord to monitor GPU metrics and detect anomalies.
C) Ispci -v to verify the adapter is detected and its resources are allocated correctly.
D) ethtool to examine the adapter's Ethernet settings and statistics.
E) ibstat to check the adapter's status, link speed, and active ports.
4. You encounter an error during the BlueField OS flashing process using 'bfboot: 'ERROR: Could not detect a BlueField device'. Which of the following steps is MOST likely to resolve the issue?
A) Verify that the correct PCIe slot is being used. Some systems may have specific slots designated for SmartNICs.
B) Ensure the BlueField device is powered on and properly connected to the host system via PCIe.
C) Install the Mellanox OFED drivers on the host system. These drivers are required for 'bfboot' to function correctly.
D) Update the 'bfboot' utility to the latest version. Older versions may have compatibility issues.
E) Check the systems BIOS/UEFI to confirm that SR-IOV is enabled.
5. Which of the following are key considerations when choosing between CPU pinning and NUMA (Non-Uniform Memory Access) awareness for a distributed training job on a multi-socket AMD EPYC server with multiple GPUs?
A) CPU pinning is generally more important than NIJMA awareness because it directly impacts CPU utilization.
B) Neither CPU pinning nor NUMA awareness are relevant for GPIJ-accelerated workloads, as the GPUs handle all the computation.
C) Both CPU pinning and NUMA awareness are critical for optimizing performance. They should be used in conjunction to achieve optimal performance.
D) NUMA awareness is generally more important than CPU pinning because it directly impacts memory bandwidth.
E) CPU pinning ensures that each process/thread runs on a specific CPU core, reducing context switching overhead. NUMA awareness ensures that the CPU cores and memory used by a process are located within the same NUMA node, minimizing memory access latency.
Solutions:
Question # 1 Answer: D,E | Question # 2 Answer: A,B | Question # 3 Answer: A,C,D,E | Question # 4 Answer: B | Question # 5 Answer: C,E |