Which two methods are used by an AP that is trying to discover a wireless LAN controller? (Choose two.)

Question

Options

• ACisco Discovery Protocol neighbor
• Bbroadcasting on the local subnet
• CDNS lookup cisco-DNA-PRIMARY.local domain
• DDHCP Option 43
• Equerying other APs

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

Explanation

AP-to-WLC Discovery Methods

When an AP boots up and needs to find a Wireless LAN Controller (WLC), it uses local subnet broadcasting (Option B) to send discovery requests to all devices on its subnet, and DHCP Option 43 (Option D), which allows the DHCP server to embed the WLC's IP address directly in the IP address lease response given to the AP.

Why the distractors are wrong:

• A (CDP): CDP is a Layer 2 neighbor discovery protocol used between directly connected Cisco devices - APs do not use it to locate a WLC.
• C (DNS lookup): The correct DNS hostname is CISCO-CAPWAP-CONTROLLER.localdomain, not cisco-DNA-PRIMARY - that name simply doesn't exist in the CAPWAP discovery process.
• E (Querying other APs): APs do not poll each other to find a WLC; this is not part of the CAPWAP discovery mechanism.

Memory Tip: Think "Broadcast or Borrow" - the AP either broadcasts locally to find the WLC, or borrows the WLC address from the DHCP server via Option 43. Both methods are part of the standard CAPWAP (Control and Provisioning of Wireless Access Points) discovery process.

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