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

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 3

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 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

You notice performance degradation in your InfiniBand fabric, particularly when multiple large datasets are being transferred simultaneously. You run diagnostic tools but do not detect obvious hardware failures. Which diagnostic technique would most likely reveal the source of this issue?

Options :

A : Inspecting Congestion Control Mechanisms

B : Checking Port Error Counters for CRC Errors

C : Testing QP (Queue Pair) Depth

D : Verifying Link Initialization

Answer: A

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