Question 1

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 2

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 3

Your organization is deploying a new InfiniBand-based storage network for real-time data processing. Ensuring high performance is critical, but at the same time, the network must be highly reliable to handle the lossless transmission of large datasets. The environment will scale over time, and both storage and compute traffic will share the same fabric. You must implement a solution that ensures high performance, scalability, and minimal packet loss under heavy loads. Which best practice is most effective for ensuring reliability and performance in a scalable InfiniBand deployment that handles both compute and storage traffic?

Options :

A : Implement QoS (Quality of Service) to prioritize storage traffic while using Virtual Lanes (VLs) to segregate traffic classes.

B : Separate storage and compute traffic into different physical networks to avoid contention and improve reliability.

C : Enable congestion control and adaptive routing while maintaining high MTU sizes across all nodes.

D : Utilize static routing and disable congestion control to ensure that paths are deterministic for critical data flows.

Answer: C

Question 4

What mechanism is primarily used in InfiniBand networks to control which nodes can join and communicate within a subnet?

Options :

A : InfiniBand relies on the physical topology of the network for access control, where only physically connected devices are able to communicate.

B : InfiniBand uses subnet access codes that must be manually configured on each node to authenticate them within the subnet.

C : Partition Keys (PKeys) are used to create partitions, and nodes are only allowed to communicate if they are assigned the same PKey, providing access control within the subnet.

D : The Subnet Manager uses Service IDs (SIDs) to identify and authenticate nodes, only allowing nodes with authorized SIDs to communicate.

Answer: C

Question 5

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