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NVIDIA NCP-AII Exam - Topic 2 Question 9 Discussion

If two ports must be connected, but one is SFP and one is QSFP, for example, to connect a 25 GbE HOST CHANNEL ADAPTER to a QSFP port capable of both 100 GbE and 25 GbE, which of the following solutions would best meet this requirement?
C) QSA Adapter
A) SFP Connectors
B) SFP to 1G BASE-T (RJ45) adapter

NVIDIA NCP-AII Exam - Topic 2 Question 9 Discussion

Actual exam question for NVIDIA's NCP-AII exam
Question #: 9
Topic #: 2
[All NCP-AII Questions]

If two ports must be connected, but one is SFP and one is QSFP, for example, to connect a 25 GbE HOST CHANNEL ADAPTER to a QSFP port capable of both 100 GbE and 25 GbE, which of the following solutions would best meet this requirement?

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Suggested Answer: C

The QSA (QSFP to SFP Adapter) is a mechanical and electrical bridge that allows a single-lane SFP/SFP28 transceiver (typically 10G or 25G) to be plugged into a four-lane QSFP/QSFP28 switch port. In AI infrastructure, this is commonly used to connect low-speed management servers or legacy nodes to a high-speed backbone switch without wasting entire 100G/200G ports or requiring specialized breakout cables. The QSA adapter maps the single lane of the SFP module to the first lane of the QSFP port. This is a 'pass-through' solution that maintains the signal integrity and latency characteristics of the link. It is the verified hardware solution for port-density mismatch in NVIDIA networking environments.


by Mica at May 02, 2026, 08:57 AM

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Vashti
4 days ago
SFP to 1G BASE-T seems too slow for this setup.
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Olive
10 days ago
True, QSA Adapter is more versatile for 25 GbE.
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Jamal
15 days ago
I feel like SFP Connectors might limit options.
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Francesco
20 days ago
Agreed! It allows for flexibility in connections.
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Juan
25 days ago
I think the QSA Adapter is the best choice. It supports both SFP and QSFP.
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Dusti
1 month ago
Just use the QSA, it’s the simplest solution!
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Paris
1 month ago
Definitely C) QSA Adapter, it’s designed for this!
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Stephaine
1 month ago
Wait, I thought SFP and QSFP were totally incompatible?
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Rima
2 months ago
I disagree, A) SFP Connectors could work too.
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Cherelle
2 months ago
C) QSA Adapter is the way to go!
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Kerry
2 months ago
I feel like the SFP to 1G BASE-T adapter wouldn't work here since we're dealing with 25 GbE and 100 GbE connections.
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Marylin
3 months ago
I practiced a similar question where we had to connect different types of ports, and I think the QSA Adapter was the solution there too.
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Ronald
4 months ago
I'm not entirely sure, but I remember something about SFP connectors being limited to lower speeds.
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Pansy
4 months ago
I think the QSA Adapter is the right choice since it allows for SFP modules to connect to QSFP ports.
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