Question 1

Which statement best describes the primary function of an InfiniBand router in a high-performance computing (HPC) environment?

Options :

A : The InfiniBand router connects different InfiniBand subnets, allowing for communication between devices across multiple subnets.

B : The InfiniBand router aggregates traffic from multiple endpoints and directs it to external networks, such as Ethernet or Fibre Channel.

C : The InfiniBand router controls congestion within a subnet by distributing traffic across multiple links based on load.

D : The InfiniBand router functions as a load balancer, distributing data streams evenly across endpoints within the same subnet.

Answer: A

Question 2

A financial services company is using RDMA over InfiniBand to accelerate the processing of real-time market data between servers. The application employs zero-copy techniques to avoid unnecessary data copies during communication. However, after switching to this configuration, the company observes that CPU utilization is still relatively high during data transfers, and performance gains are less than expected. What could be the most likely reason for the suboptimal performance?

Options :

A : Zero-copy requires additional software-based data serialization, which increases CPU overhead

B : The InfiniBand adapters are not using DMA (Direct Memory Access) for data transfers

C : The application is not properly registering memory regions for RDMA operations.

D : The zero-copy mechanism only applies to small data transfers, not to larger ones

Answer: C

Question 3

Which feature of InfiniBand makes it particularly suitable for applications like artificial intelligence (AI) and machine learning (ML) workloads?

Options :

A : Remote Direct Memory Access (RDMA) for reduced CPU load and fast data transfer

B : High compatibility with legacy Ethernet switches

C : Support for Quality of Service (QoS) to prioritize traffic

D : Built-in firewall and network security features

Answer: A

Question 4

You are configuring an InfiniBand fabric to optimize high-throughput, low-latency communication for a large-scale HPC cluster. Which advanced InfiniBand feature allows you to ensure traffic prioritization and reduce congestion for critical workloads?

Options :

A : Multipathing (MPIO)

B : Adaptive Routing (AR)

C : Credit-Based Flow Control

D : Service Level (SL) to Virtual Lane (VL) Mapping

Answer: D

Question 5

Which of the following best describes how RDMA (Remote Direct Memory Access) operations work within the InfiniBand protocol stack?

Options :

A : RDMA bypasses the CPU and operating system on the data path, allowing data to be directly transferred between the memory of two systems, reducing CPU overhead and improving data throughput.

B : RDMA allows memory access directly from one host’s CPU to another host-s memory without any involvement of the memory controller, reducing latency.

C : RDMA only works over the physical layer of the InfiniBand stack and requires additional middleware to handle data transfer at the transport layer.

D : RDMA requires the intervention of the OS kernel in both the sending and receiving systems, as it relies on kernel space memory buffers for transferring data between nodes.

Answer: A

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