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  1. Home
  2. NVIDIA Certification
  3. NCA-AIIO Exam
  4. NVIDIA.NCA-AIIO.v2026-09-18.q123 Dumps
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Question 16

In a large enterprise cluster, frequent out-of-memory errors occur mid-experiment. What operational feature resolves this?

Correct Answer: B
The correct answer is B because out-of-memory issues in shared AI clusters are typically addressed through workload resource management, reservations, and monitoring. NVIDIA Run:ai documentation states that workload management includes "Workload scheduling" to "prioritize and allocate GPUs based on workload needs" and "Monitoring and insights" to "track real-time and historical data on GPU usage to help track resource consumption and optimize costs." It also says NVIDIA Run:ai supports "Fractional GPU usage" so users can "request and utilize only a fraction of a GPU's memory, ensuring efficient resource allocation and leaving room for other workloads." This directly supports option B: resource reservation and usage monitoring in the workload manager.
Containers do not "boost" physical GPU memory, and simply increasing node count automatically does not correct the root cause if jobs are not requesting, reserving, or being monitored for the correct memory usage.
Reference: NVIDIA Run:ai Documentation - Overview, Workload scheduling, Monitoring and insights, Fractional GPU usage.
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Question 17

Which protocol is most critical for low-latency GPU-to-GPU transfers in large AI clusters using Ethernet?

Correct Answer: C
RoCE is the correct answer because it provides RDMA over Ethernet for low-latency, efficient data movement. NVIDIA networking documentation states: "Remote Direct Memory Access (RDMA) is the remote memory management capability that allows server-to-server data movement directly between application memory without any CPU involvement." It then states: "RDMA over Converged Ethernet (RoCE) is a mechanism to provide this efficient data transfer with very low latencies on lossless Ethernet networks." NVIDIA DOCA documentation similarly states that RoCE extends RDMA functionality to lossless Ethernet networks, delivering "high-throughput, ultra-low latency communication." This is especially important for large AI clusters because distributed training requires fast GPU-to-GPU and node-to-node communication. NVIDIA states that Spectrum-X builds on Ethernet with RoCE extensions to enhance performance for AI, bringing InfiniBand-style best practices such as adaptive routing and congestion control to Ethernet.
Why the other options are incorrect: DCTCP and ECN can support congestion control, but they are not the core GPU-to-GPU low-latency data-transfer protocol. PFC-only Ethernet without RDMA does not provide the direct memory-access benefit. iWARP is RDMA over TCP, but NVIDIA AI Ethernet designs emphasize RoCE for high-performance AI networking.
Reference: NVIDIA Networking RoCE documentation; NVIDIA DOCA RoCE documentation; NVIDIA Technical Blog on Networking for Data Centers and the Era of AI.
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Question 18

A simul-ation is bottlenecked by memory transfer speeds. Which GPU architectural feature addresses this?

Correct Answer: A
The correct answer is A because memory-transfer bottlenecks are addressed by GPU memory-system features such as high-bandwidth memory, shared memory, cache, and high-bandwidth interconnects or buses.
NVIDIA's Blackwell tuning guide describes the GPU memory system and states that the NVIDIA B200 GPU supports HBM3 and HBM3e high-bandwidth memory with capacity up to 180 GB. NVIDIA's CUDA tuning documentation also describes shared memory as an important architectural resource available per streaming multiprocessor, which helps reduce slower memory traffic when used effectively.
Why the other options are incorrect: GPUs are not normally wired as main disk controllers. Increasing generic PCIe I/O ports does not directly solve simulation memory-transfer bottlenecks inside GPU execution.
Dedicated inference ASICs are not the general NVIDIA GPU architectural feature used to address memory- transfer performance in simulation workloads.
Reference: NVIDIA CUDA Blackwell Tuning Guide; NVIDIA CUDA Ada GPU Architecture Tuning Guide.
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Question 19

During a high-intensity AI training session on your NVIDIA GPU cluster, you notice a sudden drop in performance. Suspecting thermal throttling, which GPU monitoring metric should you prioritize to confirm this issue?

Correct Answer: C
Thermal throttling occurs when a GPU reduces its performance to prevent overheating, a common issue during high-intensity AI training workloads that push GPUs to their limits. The most direct way to confirm this is by monitoring the GPU Temperature and Thermal Status. NVIDIA provides tools like NVIDIA System Management Interface (nvidia-smi) and NVIDIA Data Center GPU Manager (DCGM) to track temperature in real-time. If temperatures approach or exceed the GPU's thermal threshold (typically around 85-90°C for NVIDIA GPUs like the A100), the GPU automatically downclocks to reduce heat, causing a performance drop.
Memory Bandwidth Utilization (Option A) indicates how efficiently memory is used but doesn't directly correlate with throttling. CPU Utilization (Option B) is unrelated to GPU thermal issues, as it reflects CPU load. GPU Clock Speed (Option D) might show a reduction due to throttling, but it's a symptom, not the root cause-temperature is the primary metric to check. NVIDIA's DGX systems emphasize thermal monitoring to maintain performance, making Option C the priority.
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Question 20

You are working under the supervision of a senior AI engineer on a project involving large-scale data processing using NVIDIA GPUs. The task involves analyzing a large dataset of images to train a deep learning model. You need to ensure that the data pipeline is optimized for performance while minimizing resource usage. Which of the following techniques would best optimize the data pipeline for training a deep learning model on NVIDIA GPUs?

Correct Answer: D
Implementing mixed precision training is the best technique to optimize the data pipeline for training a deep learning model on NVIDIA GPUs while minimizing resource usage. Mixed precision training uses lower- precision data types (e.g., FP16 instead of FP32), reducing memory consumption and speeding up computation without sacrificing accuracy. This allows larger batches to fit in GPU memory, improves throughput, and leverages Tensor Cores on NVIDIA GPUs (e.g., A100, H100), as detailed in NVIDIA's
"Mixed Precision Training Guide." It directly enhances pipeline efficiency by optimizing GPU resource utilization.
Loading the entire dataset into GPU memory (A) is impractical for large datasets and wastes resources. Data sharding across CPUs (B) offloads work from GPUs, slowing the pipeline. Data augmentation on the CPU (C) creates a bottleneck, as GPUs can handle augmentation faster. NVIDIA's documentation prioritizes mixed precision for performance and efficiency.
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