Which type of transceiver would you use to interconnect two switches with a high-speed network link capable of supporting data rates of 40 Gbps or more?
QSFP transceivers are commonly used for high-speed network connections and are designed to support speeds of 40 Gbps or more, which makes them suitable for interconnecting switches that require fast data transfer rates. The other options listed do not match the data rate capability of QSFP since SFP typically handles 1Gbps, and RJ45 is a connector, not a transceiver. Cat 6a is a category of twisted-pair cable that on its own doesn't determine the type of transceiver needed.
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What is a QSFP transceiver?
How do QSFP transceivers work?
What are the limitations of SFP transceivers compared to QSFP?