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NEW QUESTION # 23
Which command-line tool is typically used to monitor the status and performance of an NVIDIA NVLink Switch?
Answer: E
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 # 24
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: E
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 # 25
After Spectrum-X fabric deployment, NCCL tests show intermittent latency spikes. Which network condition most severely impacts East-West bandwidth?
Answer: D
Explanation:
Packet loss is the most severe condition because NCCL collective communication depends on predictable, reliable East-West data movement between GPUs. In Spectrum-X Ethernet fabrics, AI workloads rely on RoCE, congestion control, proper QoS, and low-loss behavior to keep GPU communication pipelines moving.
Even small amounts of packet loss can cause retransmissions, stalled collectives, increased tail latency, and reduced effective bandwidth. NCCL all-reduce and related collectives are synchronized operations, so one delayed flow or rank can slow the entire job. Transceiver firmware mismatches are serious and can contribute to instability, but the direct condition most damaging to bandwidth is actual packet loss. A 400G port running at 70% utilization is not automatically a problem if traffic is balanced and lossless behavior is maintained.
Jitter below 5 ps with consistent latency is not a severe issue; it suggests stable timing behavior. In post- deployment troubleshooting, engineers should inspect switch counters, RoCE congestion statistics, ECN/PFC behavior, retransmissions, packet drops, and NCCL logs to determine whether the fabric is causing the observed latency spikes.
NEW QUESTION # 26
Consider an AMD EPYC-based server with 8 NVIDIAAIOO GPUs connected via PCle Gen4. You're running a distributed training job using Horovod. You've noticed that communication between GPUs is a bottleneck. Which of the following NCCL configuration options would be MOST beneficial in this scenario? (Assume all options are syntactically correct for NCCL).
Answer: D
Explanation:
Since the GPUs are connected via PCle, enabling peer-to-peer (P2P) transfers between GPUs is crucial for improving communication. enables this. specifies the network interface, which is relevant for network- based communication but less so when PCle is the primary interconnect. Disabling InfiniBand CNCCL 1B DISABLE=I s) would be detrimental if InfiniBand were available. specifies the InfiniBand host channel adapter, also irrelevant if not using InfiniBand. NCCL NET PLUGIN=none' disables network based communication which is incorrect.
NEW QUESTION # 27
A system administrator needs to replace a failing GPU. Which of the following commands should be used to check slot capabilities?
Answer: B
Explanation:
lspci is used to inspect PCIe devices and slot-related capabilities, including GPU detection, PCIe link width, link speed, and bus placement. This helps verify the slot characteristics before replacing or troubleshooting a GPU.
NEW QUESTION # 28
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