Which method is used by an AP to join HA controllers and is configured in NVRAM?

Question

Options

• Astored WLC information
• BDNS
• CIP Helper Addresses
• DPrimary/Secondary/Tertiary/Backup

• A
  90% (18)
• B
  5% (1)
• C
  5% (1)

Explanation

AP Joining HA Controllers via NVRAM

Option A (Stored WLC Information) is correct because when an AP is configured for High Availability (HA), it stores the controller's IP address directly in its NVRAM (non-volatile RAM), allowing it to immediately rejoin a specific WLC upon reboot without needing any additional discovery mechanisms - this is the fastest and most direct join method.

Option B (DNS) is incorrect because while DNS can be used for AP discovery (via "CISCO-CAPWAP-CONTROLLER.localdomain"), it is a general discovery method, not specifically an HA/NVRAM-stored method. Option C (IP Helper Addresses) is wrong because IP helpers assist with DHCP-based WLC discovery (Option 43), not NVRAM-stored HA configurations. Option D (Primary/Secondary/Tertiary/Backup) is incorrect because those are priority settings that determine controller preference order, not the NVRAM-specific HA join mechanism.

Memory Tip: Think "N-V-RAM = Never Vanishes, Remembers A (specific) Manager" - NVRAM retains the WLC address even after power loss, making it the dedicated HA join method because the AP always "remembers" exactly which controller to contact.

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