NVIDIA AI Infrastructure NCP-AII Question # 29 Topic 3 Discussion
NCP-AII Exam Topic 3 Question 29 Discussion:
Question #: 29
Topic #: 3
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 solution would best meet this requirement?
A QSA adapter is the correct solution when an SFP-based device must connect to a QSFP port that supports the required speed mode. QSA stands for QSFP-to-SFP adapter. It allows an SFP or SFP28 transceiver or cable to be inserted into a QSFP or QSFP28 cage, assuming the switch port supports operation at the lower target speed, such as 25 GbE. This is useful in mixed-speed NVIDIA networking environments where a 25 GbE Host Channel Adapter must connect to a switch port that is physically QSFP but electrically capable of 25 GbE operation. SFP connectors alone do not solve the mechanical mismatch because they cannot directly fit into a QSFP cage. An SFP-to-1G BASE-T adapter is intended for 1 GbE copper RJ45 connectivity and does not meet a 25 GbE requirement. A QSFP-to-QSFP DAC cable also fails because the host side is SFP-based. During physical-layer management, engineers must confirm port capability, supported cable type, transceiver compatibility, link speed, and firmware support to avoid link-down conditions during cluster bring-up.
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