300-360 Question #227: Real Exam Question with Answer & Explanation

The correct answer is B: N+N. The N+N redundancy model divides the AP load equally across two equal groups of controllers, each running at 50% capacity. If one entire group fails, the surviving group can absorb all APs because it has sufficient remaining capacity. This is distinct from N+1, where only one spa

Question

An engineer has WLC redundancy included in WLAN design documentation, where the WLCs are loaded to half the license capacity therefore allowing half the WLCs to fail without an AP going offline at a given time. What redundancy model does this describe?

Options

AN+1
BN+N
CN+N+1
DN+1+1

Explanation

The N+N redundancy model divides the AP load equally across two equal groups of controllers, each running at 50% capacity. If one entire group fails, the surviving group can absorb all APs because it has sufficient remaining capacity. This is distinct from N+1, where only one spare controller exists to handle the failure of any single controller. N+N is more resilient and costly since it doubles the controller infrastructure, but it guarantees no AP goes offline as long as at least half the controllers remain operational.

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