Partition key (PKey) configuration for multi-tenancy: Practice Questions — NVIDIA InfiniBand Networking (NVIDIA-Certified Professional: AI Networking)

Practice Questions: Partition Key (PKey) Configuration for Multi-Tenancy in NVIDIA InfiniBand Networking

Partition Key (PKey) configuration is critical for enabling multi-tenancy in NVIDIA InfiniBand networks, ensuring secure and isolated communication between different tenants sharing the same physical infrastructure. Below are exam-style multiple-choice questions designed to test your understanding of PKey configuration and its role in multi-tenant environments.

1. What is the primary purpose of a Partition Key (PKey) in an InfiniBand network?

   • A. To assign IP addresses to hosts
   • B. To isolate traffic between different tenants
   • C. To configure link speed
   • D. To monitor bandwidth usage

   Correct answer: B

   Explanation: PKeys are used to create partitions that isolate traffic between different tenants, ensuring secure multi-tenancy by restricting communication only within the same partition.

2. In a multi-tenant InfiniBand environment, how many PKeys can be assigned per port?

   • A. Only one PKey per port
   • B. Up to 8 PKeys per port
   • C. Up to 64 PKeys per port
   • D. Unlimited PKeys per port

   Correct answer: C

   Explanation: Each InfiniBand port can be assigned up to 64 PKeys, allowing multiple partitions to coexist and support multi-tenancy.

3. Which of the following PKey values indicates a full membership in a partition?

   • A. PKey with the membership bit set to 0
   • B. PKey with the membership bit set to 1
   • C. PKey value of 0x0000
   • D. PKey value of 0xFFFF

   Correct answer: B

   Explanation: The membership bit (least significant bit) set to 1 indicates full membership, allowing the node to send and receive traffic within that partition.

4. What is the effect of configuring overlapping PKeys across different tenants in an InfiniBand fabric?

   • A. It enhances security by sharing partitions
   • B. It causes traffic leakage between tenants
   • C. It improves bandwidth utilization
   • D. It disables partitioning

   Correct answer: B

   Explanation: Overlapping PKeys can cause traffic leakage, breaking tenant isolation and compromising security in a multi-tenant environment.

5. Which tool is commonly used to configure and verify PKey assignments on NVIDIA InfiniBand switches?

   • A. nvidia-smi
   • B. ibstat
   • C. ncs
   • D. uFM

   Correct answer: C

   Explanation: The NVIDIA Cluster Switch (ncs) command-line tool is used for configuring and verifying PKey assignments on InfiniBand switches.

6. How does PKey configuration support high availability in multi-tenant InfiniBand networks?

   • A. By enabling dynamic link speed adjustment
   • B. By isolating tenant traffic to prevent disruptions
   • C. By automatically rerouting traffic through alternate paths
   • D. By encrypting all data packets

   Correct answer: B

   Explanation: PKey-based partitioning isolates tenant traffic, preventing faults or misconfigurations in one tenant’s partition from affecting others, thus supporting high availability.

7. What is the recommended practice when assigning PKeys for multi-tenancy in a large InfiniBand fabric?

   • A. Use the same PKey for all tenants to simplify management
   • B. Assign unique PKeys per tenant and avoid overlaps
   • C. Disable PKey filtering to improve performance
   • D. Assign PKeys randomly without documentation

   Correct answer: B

   Explanation: Assigning unique, non-overlapping PKeys per tenant ensures proper traffic isolation and security in multi-tenant environments.

Mastering PKey configuration is essential for the NVIDIA-Certified Professional: AI Networking exam and for deploying secure, multi-tenant InfiniBand networks in production.

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