Question 1

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 2

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 3

You are tasked with setting up an HPC cluster using MPI over InfiniBand. As part of the setup, you need to ensure optimal data transfer performance between nodes. Which of the following is the most critical MPI feature for optimizing communication over InfiniBand in this context?

Options :

A : TCP/IP Communication

B : Blocking Send/Receive Operations

C : RDMA (Remote Direct Memory Access) Support

D : Shared Memory Communication (SHM)

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

Which two of the following statements correctly describe InfiniBand’s subnet management and addressing standards as per the InfiniBand architecture? (Select two)

Options :

A : InfiniBand requires static IP addressing for managing device communication.

B : The InfiniBand Subnet Manager (SM) is responsible for configuring Local Identifiers (LIDs) and ensuring route calculation within a subnet.

C : InfiniBand devices use Ethernet MAC addresses to identify themselves within the InfiniBand fabric.

D : InfiniBand uses DNS services for name resolution within the network.

E : Global Identifiers (GIDs) are used in InfiniBand for routing between different subnets.

Answer: B,E