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NEW QUESTION # 120
Which command-line tool is typically used to monitor the status and performance of an NVIDIA NVLink Switch?
Answer: B
Explanation:
While 'nvidia-smr provides information about GPUs, 'nvswitch-cli' (or a similar vendor-provided tool, depending on the specific switch) is specifically designed for managing and monitoring the NVLink Switch itself. 'ibstat is for Infiniband, 'rocminfo' for AMD GPUs and 'Ispci' list PCl devices.
NEW QUESTION # 121
A BlueField-3 DPUis configured to run both control plane and data plane functions. After a recent software update, you notice that the data plane performance has significantly degraded, but the control plane remains responsive. What is the MOST likely cause, assuming the update didn't introduce any code bugs, and what is the BEST approach to diagnose this issue?
Answer: E
Explanation:
Resource contention is the MOST likely cause, assuming no code bugs. The update may have increased the resource demands of either the control or data plane, leading to contention. Profiling the data plane processes with 'perf or 'bpftrace' helps pinpoint the bottlenecks. Downgrading drivers or reflashing firmware are more drastic steps to take after confirming resource contention isn't the issue.
NEW QUESTION # 122
A large language model (LLM) training job is running across multiple NVIDIAAI 00 GPUs in a cluster. You observe that the GPUs within a single server are communicating efficiently via NVLink, but the inter-server communication over Ethernet is becoming a bottleneck. Which of the following strategies, focusing on cable and transceiver selection, would MOST effectively address this inter-server communication bottleneck? (Choose TWO)
Answer: A,D
Explanation:
Upgrading to higher Ethernet speeds (e.g., 400GbE) with appropriate transceivers and fiber significantly increases bandwidth for inter-server communication. Implementing InfiniBand, a technology designed for high-performance computing interconnects, offers even better performance than Ethernet. Cat8 cables improve Ethernet signal quality but don't fundamentally increase bandwidth. Reducing batch size reduces the amount of data transferred but might impact training convergence. While AOCs can improve signal quality, they don't address the underlying bandwidth limitations as effectively as faster Ethernet or InfiniBand.
NEW QUESTION # 123
You are configuring a switch port connected to a host in an NCP-AII environment. The host is running RoCEv2. To optimize performance and prevent packet loss, which flow control mechanism should you enable on the switch port?
Answer: E
Explanation:
Priority Flow Control (PFC), also known as 802.1Qbb, is the appropriate flow control mechanism for RoCEv2. RoCEv2 is a lossless Ethernet protocol, and PFC allows you to enable flow control on specific traffic classes, preventing packet loss in congested situations. By enabling PFC specifically for the traffic class carrying RoCEv2 traffic, you ensure that high-priority A1 training data is delivered reliably without being affected by congestion on other parts of the network.
NEW QUESTION # 124
Which function is used to collect the cluster counters information?
Answer: B
Explanation:
The correct answer is PM, which refers to the Performance Manager or performance-management function used for collecting performance counter information from the InfiniBand fabric. In NVIDIA AI infrastructure, cluster counters are essential for troubleshooting and optimization because they expose link-level and port- level behavior across switches, HCAs, and fabric paths. These counters can include transmitted and received data, symbol errors, link errors, congestion indicators, XmitWait, packet drops, and other telemetry used to detect performance degradation. SM, or Subnet Manager, is responsible for fabric discovery, LID assignment, routing, and maintaining the logical InfiniBand subnet, but it is not primarily the performance-counter collection function. GM and FM are not the standard answers for collecting cluster counters in this context.
NVIDIA UFM Telemetry and diagnostic tooling collect and monitor InfiniBand port statistics such as bandwidth, congestion, errors, and latency, while UFM diagnostic output also includes PM counter dumps. In AI clusters, these counters help identify cabling faults, congestion, degraded links, and issues that can reduce NCCL and RDMA performance.
NEW QUESTION # 125
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