What are the port specifications of the MX8116n FEM?

Question

Options

• ATwo QSFP56-DD interfaces 16 internal 100 GbE server-facing or 8 internal 25 GbE server-facing
• BTwo QSFP56-DD uplink ports 8 internal 100 GbE server-facing or 16 internal 25 GbE server-
• CFour QSFP56-DD interfaces 8 internal 100 GbE server-facing or 16 internal 25 GbE server-facing
• DFour QSFP56-DD interfaces 16 internal 100 GbE server-facing or 8 internal 25 GbE server-facing

• B
  89% (17)
• C
  5% (1)
• D
  5% (1)

Explanation

Option B correctly identifies the MX8116n FEM as having two QSFP56-DD uplink ports, along with 8 internal 100 GbE or 16 internal 25 GbE server-facing ports - matching Dell's official specifications for this Fabric Expander Module.

Why the distractors fail:

• A gets the uplink count right (two) but swaps the internal port numbers (16/8 instead of 8/16), and uses "interfaces" instead of the correct term "uplink ports."
• C doubles the uplink count to four and uses "interfaces" - both wrong, though the internal port numbers (8/16) are correct.
• D also says four uplink interfaces AND reverses the internal port numbers - it combines both errors from C and A.

Memory tip: Think "2 up, 8×100 or 16×25" - the MX8116n has two uplinks (not four), and the internal ports follow the rule that higher speed = fewer ports (8 at 100G vs. 16 at 25G, since 8×100 = 16×25 in total bandwidth). If you remember the bandwidth symmetry, you'll never swap the numbers.

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