350-401 Question #281: Real Exam Question with Answer & Explanation

Question

What is the responsibility of a secondary WLC?

Options

• AIt shares the traffic load of the LAPs with the primary controller.
• BIt avoids congestion on the primary controller by sharing the registration load on the LAPs.
• CIt registers the LAPs if the primary controller fails.
• DIt enables Layer 2 and Layer 3 roaming between Itself and the primary controller.

Explanation

Secondary WLC Responsibility

Option C is correct because a secondary Wireless LAN Controller (WLC) acts as a backup controller - Lightweight Access Points (LAPs) are pre-configured to fail over to it only when the primary controller becomes unavailable or unreachable. This ensures network continuity without requiring manual reconfiguration of access points during an outage.

• Option A is wrong because the secondary WLC does not share traffic load during normal operation; load balancing is a separate feature handled differently.
• Option B is wrong because the secondary controller does not share LAP registration under normal conditions; all LAPs register with the primary while it remains operational.
• Option D is wrong because Layer 2/Layer 3 roaming is managed through controller mobility groups, not through a primary/secondary relationship.

💡 Memory Tip: Think of the secondary WLC like a spare tire - it's there purely for emergencies (primary failure), not to share the everyday driving load. Primary = active, Secondary = standby.

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