What is the maximum number of spines (when using 2 uplink ports for VSX) for CX 8325-48Y8C with Leaf-to-spine port speed 40 or 100 Gbps?

Question

Options

• A2
• B4
• C6
• D8

• A
  7% (4)
• B
  2% (1)
• C
  86% (51)
• D
  5% (3)

Explanation

Option C (6) is correct because the CX 8325-48Y8C features 8 x 100G QSFP28 uplink ports. When 2 of those ports are reserved for the VSX Inter-Switch Link (ISL), exactly 6 ports remain available for spine uplinks at 40G or 100G speeds - giving a maximum of 6 spine connections.

Why the distractors are wrong:

• A (2) confuses the number of VSX uplink ports consumed with the number of spine ports remaining - it's the number subtracted, not the result.
• B (4) has no direct mapping to the hardware spec; it's a plausible-sounding middle ground but doesn't reflect the actual port math.
• D (8) is the total number of uplink ports on the switch, ignoring that 2 must be dedicated to VSX - you can't use all 8 for spines.

Memory tip: Think "8 minus 2 equals 6" - the CX 8325-48Y8C has 8 uplinks, VSX steals 2, leaving 6 for spines. The model number's "8" is your starting point, and VSX always costs you 2.

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