Which connector should a server administrator use when connecting a server that requires 40Gb network connectivity?

• A. RJ-45
• B. LC
• C. QSFP+
• D. SC

Answer: (C)

The QSFP+ connector is specifically designed for high-speed data transmission, supporting 40Gb Ethernet and InfiniBand connections. It utilizes four channels, each capable of transmitting data at 10Gbps, allowing for a total of 40Gbps throughput. This higher bandwidth makes it ideal for data centers and environments where large amounts of data need to be transferred quickly.

In contrast, RJ-45 is commonly used for standard Ethernet connections, typically supporting up to 1Gb Ethernet, with some newer standards reaching up to 10Gbps but still falling short for 40Gb connections. The LC and SC connectors are primarily used for fiber optic cables; while they are excellent for various data rates, they do not inherently support the 40Gbps connections associated with QSFP+. Thus, for scenarios where high-speed connectivity is essential, QSFP+ is the preferred choice.