When deploying an active-active solution for FC networking, over what distance is additional transmission equipment required to ensure interconnection between the two data centers?

Question

Options

• A100km
• B300km
• C50 km
• D25 km

• A
  3% (2)
• B
  14% (9)
• C
  6% (4)
• D
  77% (50)

Explanation

In active-active FC (Fibre Channel) stretched cluster deployments, 25 km is the threshold beyond which native FC links can no longer reliably carry signals without additional transmission equipment such as DWDM amplifiers, optical repeaters, or FC extenders - making D correct. The other options are incorrect because 50 km (C) is double the actual threshold, 100 km (A) is a common distance associated with general optical networking or metro WAN links rather than native FC limits, and 300 km (B) is more characteristic of long-haul or inter-city connectivity scenarios that are far outside the scope of standard active-active FC architectures. At distances beyond 25 km, signal attenuation and round-trip latency begin to degrade FC protocol handshakes enough that passive cabling alone is insufficient.

Memory tip: Think "FC = 25" - Fibre Channel's active-active sweet spot ends at a quarter of 100 km. If you remember that 100 km is the "wrong tempting answer," anchor 25 as one-quarter of it.

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