Question 1

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

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

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 4

Which of the following describes a key advantage of InfiniBand's link-layer protocol in achieving high-performance interconnects?

Options :

A : InfiniBand prioritizes traffic using a weighted round-robin scheduling mechanism.

B : InfiniBand employs credit-based flow control to manage traffic without congestion.

C : InfiniBand uses virtual LANs (VLANs) to isolate traffic, improving bandwidth efficiency.

D : InfiniBand-s link-layer operates at a fixed bandwidth, which simplifies network management.

Answer: B

Question 5

Which statement accurately describes the benefits and limitations of using RDMA over Converged Ethernet (RoCE) in a data center environment?

Options :

A : RoCE requires lossless Ethernet to avoid packet loss, which may complicate deployment.

B : RoCE operates effectively over any Ethernet network without configuration.

C : RoCE provides low-latency communication without requiring specialized hardware.

D : RoCE is suitable for all types of traffic, including those that require guaranteed delivery.

Answer: A

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