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NCP-AIN: AI Networking
Free Practice Exam Questions (page: 3)
Updated On: 2-Jan-2026

Page 3 of 15
PDF with 70 Questions

[Spectrum-X Optimization]

You are investigating a performance issue in a Spectrum-X network and suspect there might be congestion problems.

Which component executes the congestion control algorithm in a Spectrum-X environment?

  1. BlueField-3 SuperNICs
  2. NVIDIA DOCA software
  3. NVIDIA NetQ
  4. Spectrum-4 switches

Answer(s): A

Explanation:

In the Spectrum-X architecture, BlueField-3 SuperNICs are responsible for executing the congestion control algorithm. They handle millions of congestion control events per second with microsecond reaction latency, applying fine-grained rate decisions to manage data flow effectively. This ensures optimal network performance by preventing congestion and packet loss.


Reference:

NVIDIA Spectrum-X Networking Platform



[InfiniBand Optimization]

Which of the following routing protocols is not capable of avoiding credit loops?

  1. UPDOWN
  2. All routing protocols are capable of avoiding credit loops
  3. MINHOP
  4. FAT TREE

Answer(s): C

Explanation:

The MINHOP routing protocol, while efficient in finding minimal paths, does not inherently prevent credit loops. This can lead to deadlocks in the network. In contrast, routing protocols like UPDOWN and FAT TREE are designed to avoid such loops, ensuring more reliable network operation.


Reference:

Optimized Routing for Large-Scale InfiniBand Networks



[Spectrum-X Configuration]

Which of the following commands would you use to assign the IP address 20.11.12.13 to the management interface in SONiC?

  1. nv set interface mgmt ip 20.11.12.13 20.11.12.254
  2. interface mgmt0 vrf mgmt ip address 20.11.12.13 20.11.12.254
  3. sudo config interface ip add eth0 20.11.12.13/24 20.11.12.254
  4. config ip add etho 20.11.12.13/24 20.11.12.254

Answer(s): C

Explanation:

In SONiC, to assign a static IP address to the management interface, the correct command is:

sudo config interface ip add eth0 20.11.12.13/24 20.11.12.254

This command sets the IP address and the default gateway for the management interface.

SONiC (Software for Open Networking in the Cloud) is an open-source network operating system used on NVIDIA Spectrum-X platforms, including Spectrum-4 switches, to provide a flexible and scalable networking solution for AI and HPC data centers. Configuring the management interface in SONiC is a critical task for enabling remote access and network management. The question asks for the correct command to assign the IP address 20.11.12.13 to the management interface, typically identified as eth0 in SONiC, as it is the default management interface for out-of-band management.

Based on NVIDIA's official SONiC documentation, the correct command to assign an IP address to the management interface involves using the config command-line utility, which is part of SONiC's configuration framework. The command sudo config interface ip add eth0 20.11.12.13/24 20.11.12.254 is the standard method to configure the IP address and gateway for the eth0 management interface. This command specifies the interface (eth0), the IP address with its subnet mask (20.11.12.13/24), and the default gateway (20.11.12.254), ensuring proper network connectivity.

Exact Extract from NVIDIA Documentation:

"To configure the management interface in SONiC, use the config interface ip add command. For example, to assign an IP address to the eth0 management interface, run:

sudo config interface ip add eth0 <IP_ADDRESS>/<PREFIX_LENGTH> <GATEWAY>

Example:

sudo config interface ip add eth0 20.11.12.13/24 20.11.12.254

This command adds the specified IP address and gateway to the management interface, enabling network access."

-- NVIDIA SONiC Configuration Guide

This extract confirms that option C is the correct command for assigning the IP address to the management interface in SONiC. The use of sudo ensures the command is executed with the necessary administrative privileges, and the syntax aligns with SONiC's configuration model, which persists the changes in the configuration database.


Reference:

Dell EMC Networking S-Series Basic Switch Management Configuration



[AI Network Architecture]

You are optimizing an AI workload that involves multiple GPUs across different nodes in a data center. The application requires both high-bandwidth GPU-to-GPU communication within nodes and efficient communication between nodes.

Which combination of NVIDIA technologies would best support this multi-node, multi-GPU AI workload?

  1. NVLink for both intra-node and inter-node GPU communication.
  2. InfiniBand for both intra-node and inter-node GPU communication.
  3. NVLink for intra-node GPU communication and InfiniBand for inter-node communication.
  4. PCIe for intra-node GPU communication and RoCE for inter-node communication.

Answer(s): C

Explanation:

For optimal performance in multi-node, multi-GPU AI workloads:

NVLink provides high-speed, low-latency communication between GPUs within the same node.

InfiniBand offers efficient, scalable communication between nodes in a data center.

Combining these technologies ensures both intra-node and inter-node communication needs are effectively met.


Reference:

NVIDIA NVLink & NVSwitch: Fastest HPC Data Center Platform



[InfiniBand Configuration]

When designing a multi-tenancy East/West (E/W) fabric using Unified Fabric Manager (UFM), which method should be used?

  1. Partition / PKey
  2. VLAN
  3. ROMA
  4. VXLAN

Answer(s): A

Explanation:

In InfiniBand networks, Partitioning using Partition Keys (PKeys) is the standard method for implementing multi-tenancy and traffic isolation. PKeys allow administrators to define logical partitions within the fabric, ensuring that traffic is confined to designated groups of nodes. This mechanism is essential for creating secure and isolated environments in multi-tenant architectures.

The Unified Fabric Manager (UFM) leverages PKeys to manage these partitions effectively, enabling administrators to assign and control access rights across different tenants. This approach ensures that each tenant's traffic remains isolated, maintaining both security and performance integrity within the shared fabric.


Reference:

NVIDIA UFM Enterprise User Manual v6.15.6-4



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