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Top Knowledge NCP-AII Points | Professional NCP-AII: NVIDIA AI Infrastructure 100% Pass

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NVIDIA AI Infrastructure Sample Questions (Q229-Q234):

NEW QUESTION # 229
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. Both CPU pinning and NUMA awareness are critical for optimizing performance. They should be used in conjunction to achieve optimal performance.
B. Neither CPU pinning nor NUMA awareness are relevant for GPIJ-accelerated workloads, as the GPUs handle all the computation.
C. NUMA awareness is generally more important than CPU pinning because it directly impacts memory bandwidth.
D. CPU pinning is generally more important than NIJMA awareness because it directly impacts CPU utilization.
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.

Answer: A,E

Explanation:
CPU pinning and NUMA awareness are both important for optimizing performance on multi-socket systems. CPU pinning reduces context switching overhead, while NIJMA awareness reduces memory access latency. Using them together provides the best performance. They ensure the CPU and memory being used are on the same node, which reduces latency. While GPUs handle intense computation, CPUs prepare and feed data to the GPUs, and are critical for performance.

NEW QUESTION # 230
An NVIDIA-based AI server is experiencing intermittent network connectivity issues. You suspect a problem with the SFP28 transceiver connecting the server to the network. You want to use command-line tools to retrieve the DOM (Digital Optical Monitoring) information from the transceiver to diagnose the problem. Assuming you have appropriate network administration privileges, which command sequence is the MOST likely to provide the necessary DOM data (assuming 'eth0' is the interface)?

Answer: C

Explanation:
The 'ethtool -m ethos command (with appropriate sudo privileges) is specifically designed to retrieve module EEPROM information, including DOM data, from a network interface. The other commands are not designed for this purpose. 'ethtool eth01 grep transceiver' may provide some basic transceiver information but won't provide details like temperature or power levels. link show' focuses on link state, not module details. 'ifconfig' is deprecated and doesn't show detailed transceiver information. 'Ishw- provides hardware inventory but not real-time DOM.

NEW QUESTION # 231
You notice that one of the fans in your GPU server is running at a significantly higher RPM than the others, even under minimal load. ipmitool sensor' output shows a normal temperature for that GPU. What could be the potential causes?

A. The fan is attempting to compensate for restricted airflow due to dust buildup.
B. The fan bearing is wearing out, causing increased friction and requiring higher RPM to maintain airflow.
C. The fan's PWM control signal is malfunctioning, causing it to run at full speed.
D. A network connectivity issue is causing higher CPU utilization, leading to increased system-wide heat.
E. The server's BMC (Baseboard Management Controller) has a faulty temperature sensor reading, causing it to overcompensate.

Answer: A,B,C

Explanation:
A malfunctioning PWM control signal, worn fan bearings, or restricted airflow can all cause a fan to run at higher RPMs. While a faulty BMC sensor could be a cause, the question states that 'ipmitool sensor' shows a normal temperature. Network connectivity issues are less likely to cause an isolated fan to run high, if the GPU temperature is normal.

NEW QUESTION # 232
In an InfiniBand fabric, what is the primary role of the Subnet Manager (SM) with respect to routing?

A. To provide a command-line interface for users to manually configure routing tables on each InfiniBand switch.
B. To forward packets based on destination IP addresses, similar to a traditional IP router.
C. To discover the network topology, calculate routing paths, and program the forwarding tables (LID tables) in the switches.
D. To act as a firewall, blocking unauthorized traffic based on pre-defined rules.
E. To monitor the network for congestion and dynamically adjust packet priorities using Quality of Service (QOS) mechanisms.

Answer: C

Explanation:
The Subnet Manager (SM) is responsible for discovering the InfiniBand topology, calculating routes, and programming the forwarding tables (LID tables) within the switches. This is crucial for establishing connectivity and ensuring efficient data transfer within the fabric. InfiniBand uses LID (Local Identifier) based routing, not IP addresses directly.

NEW QUESTION # 233
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.

A. Disable the firewall on all servers to allow unrestricted network communication.
B. Increase the 'NCCL CONNECT TIMEOUT and *NCCL TIMEOUT environment variables to allow for longer network delays.
C. Use the Slurm 'srun' command with the '-mpi=pmi2 option to launch the training job. This ensures that Slurm properly initializes the MPl environment and sets the NCCL environment variables.
D. Decrease the batch size to reduce the amount of data transferred over the network.
E. Ensure that the InfiniBand or RoCE network is properly configured and that all servers can communicate with each other over the network. Verify the network interface names and IP addresses in the NCCL configuration.

Answer: B,C,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 # 234
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