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NEW QUESTION # 111
An InfiniBand server stops working, and a system administrator runs the "ibstat" command that provides the following output:
What is the cause of the issue?
Answer: C
Explanation:
The port shows Physical state: LinkUp, so the cable and physical link are up, but the logical State remains Initializing and SM lid is 0. In InfiniBand, a port typically remains initializing when no subnet manager is running or reachable to bring the port to the active state.
NEW QUESTION # 112
An A1 server is exhibiting unusually high CPU utilization during a GPU-accelerated workload. How can you determine if the CPU is becoming a bottleneck, preventing the GPUs from achieving their full potential?
Answer: E
Explanation:
All the options provide valid methods for identifying a CPU bottleneck. Monitoring CPU and GPU utilization, profiling the application, and running parallel benchmarks all help to determine if the CPU is limiting GPU performance.
NEW QUESTION # 113
To validate bisectional bandwidth across two racks in a Spectrum-X Ethernet fabric, which NCCL test configuration isolates East-West traffic?
Answer: C
Explanation:
In a large-scale Spectrum-X Ethernet fabric, "East-West" traffic refers to the cross-rack communication between compute nodes. To validate the "Bisectional Bandwidth" (the throughput between two halves of the cluster), administrators use NCCL tests with specific environment variables to control traffic patterns. The NCCL_TESTS_SPLIT variable is used to partition the GPUs into distinct groups for the benchmark. Setting NCCL_TESTS_SPLIT="DIV 8" is a standard configuration for multi-node testing on 8-GPU systems. It effectively divides the total number of GPUs by the node count, creating a test environment where each GPU communicates with its corresponding rank on other nodes. By combining this with -g 1 (one GPU per process) across multiple nodes, the engineer can force data to travel across the leaf-and-spine switches rather than staying within the NVLink fabric of a single node. This isolates the physical network performance from the internal GPU-to-GPU bandwidth, providing a true measurement of the fabric's ability to handle high- speed AI traffic.
NEW QUESTION # 114
Which of the following tests should be used to check for the lowest possible latency between two nodes in a fabric?
Answer: B
Explanation:
The ib_write_lat test is used to check low-level RDMA write latency between two nodes in an InfiniBand fabric. In NVIDIA AI infrastructure, latency validation is important because distributed training workloads depend on fast GPU-to-GPU synchronization across servers. Operations such as all-reduce, reduce-scatter, and parameter synchronization are sensitive to delay, especially as the number of nodes increases. The ib_write_lat utility is part of the RDMA perftest toolset and is commonly used during fabric validation to confirm that adapters, switches, cabling, routing, firmware, and Subnet Manager configuration are working correctly. ib_read_bw measures RDMA read bandwidth, not latency. ib_write_bw measures RDMA write bandwidth, not the lowest latency behavior. ib_read_lat measures read latency, but write latency is commonly used as a practical low-level latency check for RDMA fabric health. Consistently low and stable ib_write_lat results help confirm that the fabric is ready for higher-level validation with NCCL, HPL, and distributed AI workload tests.
NEW QUESTION # 115
After Spectrum-X fabric deployment, NCCL tests show intermittent latency spikes. Which network condition most severely impacts East-West bandwidth?
Answer: C
Explanation:
Packet loss is especially damaging to East-West AI fabric performance because NCCL collective operations depend on reliable, high-throughput GPU-to-GPU communication. Even small packet- loss rates can trigger retries and pipeline stalls, causing latency spikes and reducing effective bandwidth across the fabric.
NEW QUESTION # 116
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