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NVIDIA NCP-AIN Exam Dumps
NVIDIA-Certified Professional AI Networking
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Total Questions : 72
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NVIDIA NCP-AIN Sample Question Answers
Question # 1
[InfiniBand Architecture]What is the basic functionality of an IB Router?
A. Connecting Ethernet switches to an InfiniBand fabric B. Connecting SAN to an InfiniBand fabric C. Connecting NVLink domains to an InfiniBand fabric D. Connecting two (or more) InfiniBand fabrics
Answer: D
Explanation:
An InfiniBand (IB) Router connects two or more InfiniBand subnets, making it possible for nodes in
different subnets to communicate through route-managed communication.
From the official NVIDIA InfiniBand Routers Documentation:
"An InfiniBand router provides connectivity between two or more InfiniBand subnets, enabling
communication between hosts that are not on the same subnet while preserving isolation and
scalability."
Ensures fabric scalability by allowing subnet segmentation.
Uses LID routing across subnet managers (SMs).
Essential in large clusters with thousands of nodes.
Incorrect Options:
A and B are incorrect: InfiniBand does not connect directly to Ethernet or SANs without a gateway.
C is unrelated: NVLink is a GPU interconnect, not tied to InfiniBand routers.
Reference: NVIDIA InfiniBand Routers Guide
Question # 2
[InfiniBand Configuration “ Multi-Tenancy with PKey]You are tasked with configuring multi-tenancy using partition key (PKey) for a high-performancestorage fabric running on InfiniBand. Each tenants GPU server is allowed to access the sharedstorage system but cannot communicate with another tenants GPU server.Which of the following partition key membership configurations would you implement to set upmulti-tenancy in this environment?
A. Assign full membership to both GPU servers and storage system. B. Assign limited membership to both GPU servers and storage system. C. Assign limited membership PKey to the shared storage system and full membership PKey to each
tenant's GPU servers. D. Assign full membership PKey to the shared storage system and limited membership PKey to each
tenants GPU servers.
Answer: D
Explanation:
To enforce strict multi-tenancy, where:
Tenant As GPU cannot talk to Tenant Bs GPU
But both can access shared storage
The correct solution is:
Storage system → Full PKey membership
Each tenants GPU → Limited PKey membership
From the NVIDIA InfiniBand P_Key Partitioning Guide:
"A port with limited membership can only communicate with full members of the same PKey. It
cannot communicate with other limited members, even within the same partition."
This isolates tenants from each other, while allowing shared access to storage.
Incorrect Options:
A permits tenant-to-tenant communication.
B isolates everything, including access to storage.
[InfiniBand Troubleshooting]You are troubleshooting connectivity issues in your InfiniBand network and need to test basicconnectivity between nodes. Which command should you use to test basic connectivity betweenInfiniBand nodes?
A. ibping B. traceroute C. ibnetdiscover D. ping
Answer: A
Explanation:
The tool specifically designed for testing InfiniBand connectivity is **ibping**. It functions similarly
to the traditional ping utility but is optimized for InfiniBand fabrics.
From the NVIDIA InfiniBand Diagnostic Utilities Documentation:
"ibping tests the connectivity of InfiniBand nodes by sending management datagrams (MADs) and
verifying the response from the destination LID or GUID."
Tests basic node-to-node reachability
Supports testing via LID, GUID, or port number
Helps verify subnet manager routing and fabric health
Incorrect Options:
ping and traceroute are IP-based, not fabric-aware.
ibnetdiscover maps topology but doesn't test live connectivity.
Reference: InfiniBand Diagnostic Tools “ ibping
Question # 5
[InfiniBand Troubleshooting]A fabric administrator added new servers to a 40-port edge switch. The administrator now needs togather and map the newly added ports LIDs and LINK SPEED. Which of the following commands canbe used for that purpose?
A. ib_check_routes B. ibnetdiscover C. ibhosts D. ibswitches
Answer: B
Explanation:
The correct utility is ibnetdiscover.
From the official NVIDIA InfiniBand Utilities Guide:
"ibnetdiscover scans the fabric and returns a topology of all switches and end nodes, including their
GUIDs, LIDs, port numbers, and link speeds."
It generates a fabric map with node-to-port relationships and shows:
GUIDs
LIDs (Local IDs)
Link speeds and widths
Switch-to-host connections
This is essential for network topology validation and mapping physical port additions.
Incorrect Options:
ib_check_routes “ for routing table diagnostics.
ibhosts “ shows host information but not switch-level port mapping.
[Spectrum-X Optimization / NetQ]What does NetQ leverage (in addition to NVIDIA "What Just Happened" switch telemetry data andNVIDIA DOCA telemetry) to help network operators proactively identify server and application rootcause issues?
A. Flow telemetry B. Behavioral telemetry C. Application telemetry D. Packet capture telemetry
Answer: B
Explanation:
NetQ integrates multiple telemetry sources, including WJH, DOCA, and notably, Behavioral
Telemetry.
From the NetQ Documentation “ Behavioral Telemetry Section:
"Behavioral telemetry in NetQ correlates server and application behavior with network events,
offering insights into root cause analysis by detecting anomalies in protocol, path, or performance
behavior."
This helps identify patterns like:
Misbehaving applications causing retransmits.
Sudden changes in traffic flows.
Latency spikes correlated with app-level issues.
It complements device-level telemetry by introducing intent-based anomaly detection, crucial for
proactive operations.
Incorrect Options:
Flow telemetry and packet capture offer raw data but not behavioral insights.
Application telemetry is too vague and is not the term NetQ uses for this feature.
[InfiniBand Configuration]You are setting up PKey memberships for different tenants in an InfiniBand network. You want toensure that some tenants have limited communication capabilities. Which PKey membership typeallows members to communicate with full members but not with other members of the same type?
A. Restricted membership B. Isolated membership C. Full membership D. Limited/partial membership
Answer: D
Explanation:
In InfiniBand networks, P_Keys (Partition Keys) control communication boundaries. Each port can
belong to one or more partitions with either full or limited membership.
From NVIDIA InfiniBand Documentation (Partitioning and P_Keys):
"A limited (or partial) membership permits a port to communicate only with other ports in the same
partition that have full membership. It cannot communicate with other limited members, even if
they are in the same P_Key partition."
This makes limited/partial membership ideal for multi-tenant security, where tenant ports can reach
infrastructure ports (full members) but not other tenant ports (limited members).
Incorrect Options:
A & B are not valid InfiniBand P_Key types.
C (Full membership) allows unrestricted communication within the same partition.
Reference: NVIDIA InfiniBand Guide “ PKey Partitioning and Membership Types
Question # 8
[InfiniBand Configuration / Benchmarking]When utilizing the ib_write_bw tool for performance testing, what does the -S flag define?
A. The burst size B. The number of QP's C. The maximum rate of sent packages D. Which service level to use
Answer: D
Explanation:
From NVIDIA Performance Tuning Guide (ib_write_bw Tool Usage):
"-S <SL>: Specifies the Service Level (SL) to use for the InfiniBand traffic. SL is used for setting priority
and mapping to virtual lanes (VLs) on the IB fabric."
This flag is useful when testing QoS-aware setups or validating SL/VL mappings.
[AI Network Architecture “ Storage Fabric]A leading AI research center is upgrading its infrastructure to support large language model projects.The team is debating whether to implement a dedicated storage fabric for their AI workloads.Which of the following best explains why a dedicated storage fabric is crucial for this AI networkarchitecture?Pick the 2 correct responses below
A. To enable parallel data access and improve storage performance for distributed AI workloads. B. To ensure data security and isolation from other network traffic. C. To provide high-bandwidth, low-latency data access that prevents I/O bottlenecks during AI model
training. D. To reduce the overall cost of the storage infrastructure.
Answer: A, C
Explanation:
Modern AI training (especially with LLMs) requires extremely high-speed, parallel access to large
datasets. A dedicated storage fabric separates data I/O traffic from the training compute path and
avoids contention.
From NVIDIA DGX Infrastructure Reference Architectures:
"Dedicated storage networks eliminate I/O bottlenecks by providing low-latency, high-bandwidth
access to distributed storage for large-scale training jobs."
"Parallel access to datasets is key for performance, especially in multi-node, multi-GPU AI clusters."
Security (B) is important, but not the core reason for a storage fabric.
Cost (D) is typically increased, not reduced, with dedicated fabrics.
[AI Network Architecture “ Cumulus Linux]In Cumulus Linux, which technology enables the ability to provide active-active redundancy toservers, without the need for direct inter-switch links?
A. MLAG B. VSS C. EVPN Multi-homing
Answer: C
Explanation:
EVPN Multi-homing enables active-active redundancy without inter-switch links by using overlay
routing over VXLAN and distributed control plane using BGP EVPN.
From the official NVIDIA Cumulus Linux EVPN Multihoming Documentation:
"EVPN multihoming allows multiple Top-of-Rack (ToR) switches to connect to the same server while
maintaining full layer-2 redundancy without the need for inter-switch links or traditional MLAG
configuration."
Key benefits:
Simplified topology (no ISL/peer-link needed)
BGP-based control plane
Fast convergence
Active-active links per host NIC
Incorrect Options:
MLAG requires ISL between switches and peer-link configuration.
VSS (Virtual Switching System) is a Cisco term, not supported in NVIDIA networking.
Reference: Cumulus Linux Docs “ EVPN Multihoming
Question # 11
[AI Network Architecture]You're designing a multi-GPU system for AI training using NVIDIA GPUs with NVLink connections. Youneed to maximize inter-GPU communication bandwidth. Which feature included in NCCL allows forimproved communication between GPUs and NICs?
A. Adaptive Routing B. PXN C. Graph Search Optimization D. SHARP v2
Answer: B
Explanation:
The correct answer is PXN (Peer eXchange Network).
From the NVIDIA NCCL Documentation:
"PXN enables communication between GPUs connected via NVLink and NICs by treating the GPUs as
a distributed switch. This architecture improves bandwidth utilization by enabling any GPU to
communicate with the NIC via the shortest path available, even if it's not directly connected to the
NIC."
This enhances GPU-to-NIC and NIC-to-GPU transfers, leveraging the NVLink topology. It significantly
boosts performance in multi-GPU setups where not every GPU is directly connected to the NIC.
Other options:
Adaptive Routing is a fabric-level feature for dynamic path rerouting.
Graph Search Optimization is used internally for topology modeling in NCCL.
SHARP v2 is a switch-based collective acceleration method, unrelated to PXN.
Reference: NVIDIA NCCL User Guide “ PXN Feature Section
Question # 12
[Al Network Architecture “ DPU Modes]In which mode of the BlueField DPU does the ARM system on the DPU control the NIC data path, butallow access to the DPU OS from the host?
A. Separated Host mode B. NIC mode C. DPU mode D. Restricted mode
Answer: C
Explanation:
In DPU Mode, the ARM cores on BlueField own the NIC data path, while still allowing the host system
to access the DPU OS (via OOB or virtio).
From NVIDIA BlueField Documentation:
"In DPU Mode, the data path is offloaded to the BlueField Arm cores, enabling advanced security and
networking functions, while still allowing host access to the BlueField OS."
This is different from:
NIC Mode: Data path controlled by host, ARM cores inactive.
[InfiniBand Troubleshooting]Which of the following tools in Cumulus Linux is specifically useful for detecting and differentiatingmicrobursts from regular network congestion?Pick the 2 correct responses below
A. Monthly network utilization reports B. ASIC monitoring with millisecond-level granularity C. SNMP polling at 5-minute intervals D. What Just Happened (WJH) feature for packet drop analysis
Answer: B, D
Explanation:
In Cumulus Linux, microbursts are short-lived, high-volume traffic bursts that often go undetected by
coarse-grained monitoring like SNMP.
The two tools specifically used for this purpose are:
What Just Happened (WJH)
"WJH provides real-time packet drop visibility and classifies drops by reason (e.g., congestion, ACLs,
etc.), enabling microburst detection."
ASIC monitoring at millisecond granularity
"Deep telemetry is enabled via the switch ASIC, which provides sub-second counters that capture
microburst patterns otherwise missed by SNMP."
Incorrect Options:
A and C provide low-frequency sampling, insufficient for microbursts which last milliseconds.
Reference: NVIDIA NetQ & Cumulus Linux Documentation “ What Just Happened (WJH)
Question # 14
[InfiniBand Optimization]Which of the following NCCL environment variables enable SHARP aggregation with NCCL whenusing the NCCL-SHARP plugin?Pick the 2 correct responses below
A. NCCL_COLLNET_ENABLE=1 B. NCCL_ALGO=CollNet C. NCCLSPECTRUM_ENABLE=1 D. NCCL_SHARP_AUTOINIT
Answer: A, D
Explanation:
To enable SHARP (Scalable Hierarchical Aggregation and Reduction Protocol) aggregation using the
NCCL-SHARP plugin, the following two environment variables are required:
NCCL_COLLNET_ENABLE=1
Enables NCCLs support for CollNet (Collective Network) operations, including SHARP.
NCCL_SHARP_AUTOINIT=1
Automatically initializes the SHARP plugin when available, activating SHARP-based collectives.
From the NVIDIA NCCL User Guide “ SHARP Plugin Section:
"NCCL_COLLNET_ENABLE must be set to enable collective network acceleration features."
"NCCL_SHARP_AUTOINIT enables automatic SHARP plugin integration at NCCL runtime."
Incorrect Options:
B . NCCL_ALGO=CollNet “ This variable controls the algorithm used for collectives but does not
enable SHARP.
C . NCCLSPECTRUM_ENABLE “ This is not a documented NCCL variable.
