Question 1

How does Partitioning in an InfiniBand network enhance security, and what is the correct method for configuring it to prevent unauthorized communication between devices?

Options :

A : Partitioning configures access control lists based on device MAC addresses, preventing unauthorized devices from joining the fabric.

B : Partitioning isolates traffic by assigning devices to specific Partition Keys (P_Keys), and only devices with matching P_Keys can communicate, providing strong segmentation.

C : Partitioning uses VLAN tags similar to Ethernet networks, ensuring that only devices within the same VLAN can communicate, thereby preventing unauthorized traffic.

D : Partitioning creates encrypted tunnels between InfiniBand devices, ensuring secure communication even if unauthorized devices attempt to intercept the traffic.

Answer: B

Question 2

You are configuring the HCAs in your InfiniBand environment to maximize performance for a high-throughput, low-latency application. Which tuning parameter should you adjust on the HCA to reduce latency without causing packet loss?

Options :

A : Increase the MTU (Maximum Transmission Unit) to its highest supported value.

B : Decrease the MTU (Maximum Transmission Unit) to minimize the time it takes for small packets to be transmitted.

C : Adjust the Receive Queue Depth (RQD) to increase the ability to handle incoming traffic bursts.

D : Tune the SL (Service Level) to prioritize the application traffic over other traffic.

Answer: C

Question 3

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

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

Your organization has deployed an InfiniBand fabric for a data center, but recently you have been experiencing intermittent latency spikes and congestion issues. The InfiniBand fabric is used for both storage traffic (NVMe-oF) and computational workloads (GPU training). You suspect that the congestion is caused by unbalanced traffic patterns and insufficient congestion control mechanisms. Which of the following best practices should be implemented to address congestion and latency issues in your InfiniBand deployment?

Options :

A : Increase the MTU size for all links to reduce the number of packets traversing the fabric, reducing congestion.

B : Implement Congestion Control (CC) and use ECN (Explicit Congestion Notification) to reduce latency and balance traffic loads.

C : Use copper cables with built-in flow control mechanisms to improve resilience against congestion.

D : Enable Virtual Lane (VL) arbitration and configure lossless Ethernet to ensure priority for storage traffic.

Answer: B