Question 1

You are configuring an HPC cluster that leverages InfiniBand technology. You aim to achieve optimal performance by fine-tuning Quality of Service (QoS) settings to manage different types of network traffic. Which of the following is the most important factor to consider when configuring QoS for InfiniBand in an HPC environment?

Options :

A : Virtual Lanes (VLs) and Service Levels (SLs)

B : MAC Address Table Size

C : Port Mirroring

D : Spanning Tree Protocol (STP) settings

Answer: A

Question 2

You are responsible for the deployment of a large-scale data center using NVIDIA's InfiniBand for AI workloads. Your goal is to ensure both the scalability and reliability of the fabric as the data center grows over time. The initial deployment involves 100 nodes, but you plan to expand to 500 nodes within the next year. It's critical that performance scales with the growth, minimizing bottlenecks, and ensuring reliability without network downtime. Which best practice should you implement to ensure scalability and reliability in a production InfiniBand environment as your data center grows?

Options :

A : Implement a spine-leaf topology using adaptive routing and a lossless network design.

B : Deploy a multi-tier fat-tree topology with oversubscription to optimize cost and limit hardware.

C : Use a single large switch for all nodes to reduce latency and simplify network management.

D : Enable Flow Control on all ports and restrict packet sizes to prevent congestion.

Answer: A

Question 3

Which two of the following statements correctly describe InfiniBand’s subnet management and addressing standards as per the InfiniBand architecture? (Select two)

Options :

A : InfiniBand requires static IP addressing for managing device communication.

B : The InfiniBand Subnet Manager (SM) is responsible for configuring Local Identifiers (LIDs) and ensuring route calculation within a subnet.

C : InfiniBand devices use Ethernet MAC addresses to identify themselves within the InfiniBand fabric.

D : InfiniBand uses DNS services for name resolution within the network.

E : Global Identifiers (GIDs) are used in InfiniBand for routing between different subnets.

Answer: B,E

Question 4

Which of the following correctly describes the role of the HCA in InfiniBand’s connection-oriented (reliable) transport mechanism?

Options :

A : HCAs handle flow control and congestion management at the application layer, ensuring no data is lost in transmission.

B : HCAs perform hardware-based packet retransmission at the switch level to ensure reliability in connection-oriented transfers.

C : HCAs are responsible for managing reliable connections through queue pairs (QPs), which enable reliable data transfer between nodes.

D : HCAs manage connection setup and teardown for RDMA, ensuring that each connection is uniquely identified by a Local Identifier (LID).

Answer: C

Question 5

In AI/ML training clusters, how does Remote Direct Memory Access (RDMA) over InfiniBand accelerate the performance of distributed deep learning?

Options :

A : RDMA over InfiniBand enables deep learning models to share memory across GPUs, allowing for larger models to be trained without memory bottlenecks.

B : RDMA over InfiniBand simplifies the orchestration of distributed training jobs by automating workload balancing across GPUs and nodes.

C : RDMA over InfiniBand automatically compresses the data being transferred, which reduces the bandwidth required for communication between GPUs.

D : RDMA over InfiniBand allows direct data transfer between GPUs without passing through the host CPU, significantly reducing the overhead during parameter updates.

Answer: D

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