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NVIDIA NCP-AII Exam - Topic 2 Question 3 Discussion

You are a network administrator responsible for configuring an East-West (E/W) Spectrum-X fabric using SuperNIC. The Bluefield-3 devices in your network should be set to NIC mode with RoCE enabled to optimize data flow between servers. You have access to the Spectrum-X management tools and the necessary documentation. You need to use specific configuration commands to achieve this setup. Which of the following steps and commands are necessary to configure the Bluefield-3 devices in NIC mode for the E/W Spectrum-X fabric using SuperNIC? (Pick the 2 correct responses below)
A) Use the command sudo mlxconfig -d /dev/mst/<device> set LINK_TYPE_P1=2 to enable Ethernet on the Bluefield-3 devices. and C) Use the command sudo mlxconfig -d /dev/mst/<device> set INTERNAL_CPU_OFFLOAD_ENGINE=1 to configure the SuperNIC to operate in NIC mode.
B) Use the command sudo mlxconfig -d /dev/mst/<device> set DISABLE_SPECTRUM_X=1 to reduce overhead.
D) Use the command sudo mlxconfig -d /dev/mst/<device> set DPU_MODE=1 to set up the Bluefield-3 devices in DPU mode.

NVIDIA NCP-AII Exam - Topic 2 Question 3 Discussion

Actual exam question for NVIDIA's NCP-AII exam
Question #: 3
Topic #: 2
[All NCP-AII Questions]

You are a network administrator responsible for configuring an East-West (E/W) Spectrum-X fabric using SuperNIC. The Bluefield-3 devices in your network should be set to NIC mode with RoCE enabled to optimize data flow between servers. You have access to the Spectrum-X management tools and the necessary documentation. You need to use specific configuration commands to achieve this setup. Which of the following steps and commands are necessary to configure the Bluefield-3 devices in NIC mode for the E/W Spectrum-X fabric using SuperNIC? (Pick the 2 correct responses below)

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Suggested Answer: A, C

NVIDIA Spectrum-X is the world's first high-performance Ethernet fabric designed specifically for AI, combining Spectrum-4 switches with BlueField-3 SuperNICs. To achieve the high-throughput, low-latency requirements of East-West (server-to-server) AI traffic, the BlueField-3 hardware must be correctly provisioned. The first requirement is ensuring the physical ports are operating in Ethernet mode; LINK_TYPE_P1=2 (and P2=2 for the second port) toggles the hardware from InfiniBand to Ethernet mode. Secondly, the BlueField-3 can operate in several 'modes.' While 'DPU mode' (Option D) offloads the entire OS to the ARM cores, 'NIC mode' (or SuperNIC mode) allows the host to manage the networking while leveraging the Internal CPU Offload Engine. Setting INTERNAL_CPU_OFFLOAD_ENGINE=1 is a specific configuration step for Spectrum-X that allows the SuperNIC to handle RoCE (RDMA over Converged Ethernet) and Congestion Control (CC) algorithms more efficiently at 400G speeds. This setup is vital for AI workloads like LLM training, where consistent latency and zero-packet-loss are non-negotiable for collective communications.


by Glory at Mar 08, 2026, 01:47 AM

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Melodie
17 hours ago
I think A and C are the right choices. Ethernet needs to be enabled for proper data flow.
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Quiana
6 days ago
Surprised that RoCE needs all these specific commands!
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Ciara
11 days ago
B) seems unnecessary, why disable Spectrum-X?
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Lorean
2 months ago
Wait, isn't D) for a different mode?
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Aleta
2 months ago
I think C) is the right choice too!
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Glendora
2 months ago
A) is definitely needed for Ethernet setup.
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Taryn
2 months ago
Wait, are we sure about C)? Sounds a bit off to me.
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Gayla
3 months ago
D) is totally wrong, we need NIC mode, not DPU mode!
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Jospeh
3 months ago
B) seems unnecessary, why disable Spectrum-X?
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Tesha
3 months ago
I think C) is the right command for NIC mode.
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Sabra
3 months ago
A) is definitely needed to enable Ethernet.
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Precious
3 months ago
I feel like option D is definitely not what we want since we need NIC mode, not DPU mode.
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Lauran
3 months ago
I'm a bit confused about option B. Reducing overhead sounds good, but does it really help with the E/W fabric setup?
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Michel
4 months ago
I remember practicing a similar question, and I think option C is definitely the one to configure SuperNIC for NIC mode.
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Catarina
4 months ago
I think option A is about enabling Ethernet, but I'm not entirely sure if that's the right command for NIC mode.
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