Question 1

Which of the following best describes how load balancing is achieved in an InfiniBand fabric using switches?

Options :

A : Load balancing is achieved by dynamically reassigning Local Identifiers (LIDs) to redistribute traffic across available ports.

B : Switches in an InfiniBand fabric use static routes for each connection, making load balancing impossible without manual reconfiguration.

C : InfiniBand switches use Adaptive Routing to dynamically select alternative paths based on real-time congestion information.

D : Load balancing is managed by the Host Channel Adapters (HCAs), and switches play no role in traffic distribution.

Answer: C

Question 2

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 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

You are configuring an InfiniBand-based high-performance computing (HPC) cluster for a scientific simulation workload that requires low latency and high throughput communication between nodes. The application is designed to leverage RDMA (Remote Direct Memory Access) to bypass the CPU and improve data transfer efficiency. You notice that while the latency is low, the throughput is not meeting expected levels. Which of the following is the most effective method to optimize RDMA performance for this application?

Options :

A : Enable CPU coalescing to allow RDMA to use more CPU resources

B : Ensure proper alignment of memory buffers to cache lines.

C : Increase MTU size on InfiniBand network interfaces

D : Disable flow control mechanisms for RDMA transfers

Answer: B

Question 5

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

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