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NVIDIA AI Infrastructure Sample Questions:

1. Which protocol is commonly used in Spine-Leaf architectures for dynamic routing and load balancing across multiple paths?

A) ECMP (Equal-Cost Multi-Path)
B) STP (Spanning Tree Protocol)
C) OSPF (Open Shortest Path First)
D) BGP (Border Gateway Protocol)
E) VRRP (Virtual Router Redundancy Protocol)

2. Which of the following statements are true regarding the use of Congestion Management (CM) and Congestion Avoidance (CA) techniques within an InfiniBand fabric using NVIDIA technology? (Select TWO)

A) CM/CA are not relevant in InfiniBand fabrics because InfiniBand's lossless nature guarantees that no packets will ever be dropped due to congestion.
B) InfiniBand's Explicit Congestion Notification (ECN) is a CA mechanism that allows switches to signal congestion to endpoints before packet loss occurs.
C) CM/CA mechanisms are primarily implemented at the IP layer and are independent of the InfiniBand transport layer.
D) CM can include techniques like rate limiting to throttle traffic flows when congestion is detected.
E) CM aims to reduce the severity of congestion once it has already occurred, while CA aims to prevent congestion from happening in the first place.

3. An AI infrastructure utilizes NVIDIA ConnectX-7 NICs for inter-node communication. The requirement is to achieve a bandwidth of 400GbE with low latency over a distance of 100 meters. Which transceiver and cable type combination is MOST suitable for this scenario?

A) QSFP-DD FR4 transceiver with single-mode fiber cable.
B) QSFP-DD DR4 transceiver with single-mode fiber cable.
C) QSFP-DD SR4 transceiver with OM4 multi-mode fiber cable.
D) QSFP-DD LR8 transceiver with OM4 multi-mode fiber cable.
E) QSFP-DD SR8 transceiver with OM3 multi-mode fiber cable.

4. You are upgrading an AI server with new NVIDIAA800 GPUs and require 400GbE connectivity. After installing the new QSFP-DD transceivers and connecting the fiber cables, the link does not come up. You suspect a polarity issue. Assuming you are using MPO/MTP connectors, which of the following steps would BEST help diagnose and rectify a potential polarity mismatch? (Choose TWO)

A) Consult the cable manufacturer's documentation to verify the MPO/MTP key orientation and pinout configuration and ensure it aligns with the transceiver requirements.
B) Replace the QSFP-DD transceivers with known working units.
C) Use a fiber optic polarity tester to confirm correct TX/RX mapping through the entire cable assembly.
D) Use an Optical Time Domain Reflectometer (OTDR) to verify cable integrity.
E) Swap the transmit (TX) and receive (RX) fibers at one end of the connection.

5. You are using GPU Direct RDMA to enable fast data transfer between GPUs across multiple servers. You are experiencing performance degradation and suspect RDMA is not working correctly. How can you verify that GPU Direct RDMA is properly enabled and functioning?

A) Examine the 'cimesg' output for any errors related to RDMA or InfiniBand drivers.
B) Use the 'ibstat command to verify that the InfiniBand interfaces are active and connected.
C) Check the output of 'nvidia-smi topo -m' to ensure that the GPUs are connected via NVLink and have RDMA enabled.
D) Ping the other servers to ensure network connectivity.
E) Run a bandwidth benchmark using a tool like or to measure the RDMA throughput.

Solutions: