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Answer : D

The ibstat command is utilized to display the operational status of InfiniBand Host Channel Adapters (HCAs). It provides detailed information, including the state (e.g., Active, Down), physical state (e.g., LinkUp, Polling), and link layer (e.g., InfiniBand, Ethernet) of each port on the HCA. This information is crucial for diagnosing connectivity issues and ensuring that the InfiniBand interfaces are functioning correctly.

Reference Extracts from NVIDIA Documentation:

'The ibstat command displays the status of the host channel adapters (HCAs) in your InfiniBand fabric. The status includes the HCAs' state, physical state, and link layer.'

'For proper operation, you are looking for 'State: Active' and 'Physical State: LinkUp'.'

Answer : A

The tool specifically designed for testing InfiniBand connectivity is **ibping**. It functions similarly to the traditional ping utility but is optimized for InfiniBand fabrics.

From the NVIDIA InfiniBand Diagnostic Utilities Documentation:

'ibping tests the connectivity of InfiniBand nodes by sending management datagrams (MADs) and verifying the response from the destination LID or GUID.'

Tests basic node-to-node reachability

Supports testing via LID, GUID, or port number

Helps verify subnet manager routing and fabric health

Incorrect Options:

ping and traceroute are IP-based, not fabric-aware.

ibnetdiscover maps topology but doesn't test live connectivity.

Answer : C

NVIDIA BlueField Data Processing Units (DPUs) are integral to securing AI infrastructures, especially in environments requiring stringent data privacy and security measures. BlueField DPUs offload and accelerate critical infrastructure tasks such as encryption, firewall enforcement, and intrusion detection, thereby isolating sensitive data paths from potential threats.

In the context of AI workloads, BlueField DPUs enable secure and efficient data movement between GPUs and storage systems, ensuring that sensitive information, like financial data, is protected during both training and inference processes. Their integration into NVIDIA's reference architectures provides a hardware root of trust, essential for maintaining data integrity and compliance with security standards.

Answer : A

NVIDIA's What Just Happened (WJH) is a feature that provides real-time visibility into network problems by analyzing all packets passing through the switch and alerting on performance issues caused by packet drops, congestion, high latency, or misconfigurations.

WJH retains the last packets that were dropped from the switch with complete packet headers and the actual drop reason. This enhances the ability to debug network problems, identify affected flows, and decrease time-to-repair.

Answer : B

The mlxlink tool is used to check and debug link status and issues related to them. The tool can be used on different links and cables (passive, active, transceiver, and backplane). It is intended for advanced users with appropriate technical background.