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NVIDIA AI Infrastructure Sample Questions:

1. You are setting up a new AI inference server in a colocation facility. The server will be connected to a 100GbE switch managed by the facility. You have the option to use either a single-mode fiber connection with an LR4 transceiver or a multi-mode fiber connection with an SR4 transceiver. The distance between your server and the switch is approximately 75 meters. Considering cost, signal quality, and future scalability, which option is MOST suitable?

A) Either option is equally suitable; the choice is arbitrary.
B) LR4 transceiver with single-mode fiber, as it provides better signal quality over distance.
C) LR4 transceiver with single-mode fiber, as it provides better power efficiency.
D) AOC cable, as it provides better future scalabilty than any other type of connection
E) SR4 transceiver with multi-mode fiber, as it is typically more cost-effective for shorter distances.

2. You are configuring a network for a distributed training job using multiple DGX servers connected via InfiniBand. After launching the training job, you observe that the inter-GPU communication is significantly slower than expected, even though 'ibstat' shows all links are up and active. What is the MOST likely cause of this performance bottleneck?

A) The default MTU size of 1500 is too small for efficient large data transfers.
B) Incorrect placement of GPUs across NUMA nodes, leading to increased inter-node latency.
C) The CPU frequency scaling governor is set to 'powersave', limiting CPU performance.
D) The InfiniBand subnet manager (SM) is configured incorrectly or experiencing performance issues (e.g., path selection is suboptimal, congestion control is not enabled).
E) The RDMA memory registration limit is too low, causing frequent memory registration and unregistration overhead.

3. You are attempting to install NGC CLI on a CentOS 7 system, but the 'pip install nvidia-cli' command fails with a 'Could not find a version that satisfies the requirement nvidia-cli' error. You have confirmed that 'pip' is installed and working. What could be the cause of this issue?

A) The 'pip' version is outdated and incompatible with the NGC CLI package. Upgrade 'pip' using 'pip install -upgrade pip'.
B) The system's package manager (YUM) is not configured correctly, preventing 'pip' from finding the NGC CLI package.
C) The CentOS 7 system does not have the required Python version installed. NGC CLI requires Python 3.6 or later.
D) The system's firewall is blocking access to the Python Package Index (PyPl). CentOS 7 is not supported by NGC CLI.

4. You've installed the NGC CLI, but when you run 'ngc registry model list' you get an error indicating authentication failure. You're sure your API key is correct. What could be the cause, and how would you diagnose this?

A) Your organization might be behind a proxy that is blocking the NGC CLI from accessing the internet. Configure the proxy settings for the NGC CLI.
B) Your account lacks the necessary permissions to access the NGC registry. Contact your NVIDIA administrator.
C) The host machine's clock is not synchronized, causing authentication issues. Synchronize the clock using 'ntpd' or 'chronyd'.
D) The NGC CLI version is outdated. Upgrade to the latest version using 'pip install -upgrade nvidia-cli'.
E) The environment variables 'NGC API_KEY or 'NGC CLI_API_KEY are set incorrectly or not set at all. Verify and set them correctly.

5. You're configuring a BlueField-3 DPU-based server for high-performance storage. You want to utilize NVMe-oF (NVMe over Fabrics) to access remote NVMe SSDs. What is the primary benefit of using a BlueField DPU in this NVMe-oF setup compared to a traditional server with a standard NIC?

A) BlueField DPU provides built-in hardware encryption for all NVMe-oF traffic.
B) BlueField DPU offloads the NVMe-oF protocol processing, reducing CPU overhead on the host server.
C) BlueField DPU automatically configures the NVMe-oF target without any manual intervention.
D) BlueField DPU eliminates the need for a separate NVMe-oF target server.
E) BlueField DPU allows hot-swapping of NVMe SSDs without interrupting the NVMe-oF connection.

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