A customer's infrastructure is set up to use both primary and secondary gateway clusters on the SSID profile based on best practices. Why do they have an equal split of their 260 APs across the…

Question

Options

• AThe primary gateway cluster is up, but some APs cannot reach the secondary gateway cluster.
• BThe secondary gateway cluster is homogeneous
• CThe secondary gateway cluster is heterogeneous
• DThe primary gateway cluster is up, but some APs cannot reach the primary gateway cluster.

• A
  5% (2)
• B
  10% (4)
• C
  27% (11)
• D
  59% (24)

Explanation

Option D is correct because when the primary gateway cluster is operational but a subset of APs lack network reachability to it, those APs automatically fall back to the secondary gateway cluster - resulting in an equal split when exactly half the APs (130) cannot establish a path to primary. This is a reachability problem, not an availability problem: the cluster itself is healthy, but a routing or connectivity issue between certain APs and the primary cluster forces them to secondary.

Why the distractors fail:

• A is the opposite error - if APs couldn't reach the secondary cluster, they'd stay on primary, producing an unequal split (all or most on primary), not a 50/50 split.
• B and C are irrelevant - whether the secondary cluster is homogeneous or heterogeneous (same vs. mixed gateway models) has no bearing on which APs connect to it; those are capacity/compatibility considerations, not routing decisions.

Memory tip: Associate the equal split with a "hidden wall" between half the APs and the primary cluster - the primary is alive and well, but those APs are blocked from seeing it, so they route around to secondary. When you see a perfect split, think reachability fault on the primary path, not a cluster outage.

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