Question 1

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 2

In the InfiniBand protocol stack, each layer plays a specific role in ensuring efficient data transfer and communication. Which of the following best describes the function of the data link layer in the InfiniBand protocol stack?

Options :

A : Establishes and maintains logical connections between applications and processes

B : Handles the physical transmission of data by converting bits into electrical or optical signals

C : Provides reliable point-to-point and multicast services, as well as error detection and correction

D : Implements flow control, congestion management, and ensures in-order delivery of messages

Answer: C

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

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

In InfiniBand, Virtual Lanes (VLs) are used to provide logical isolation of traffic within a single physical connection. What is the maximum number of Virtual Lanes supported by the InfiniBand standard, and what is their primary purpose?

Options :

A : 4 Virtual Lanes, used for low-latency traffic

B : 8 Virtual Lanes, used for data traffic prioritization only

C : 16 Virtual Lanes, with all used for data transmission

D : 15 Virtual Lanes, with one reserved for management traffic

Answer: D

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