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300-370 · Question #168

You are analyzing a CAPWAP join request from an AP. Which information can you capture?

The correct answer is D. name of the WLC. When analyzing a CAPWAP join request from an Access Point (AP), you can capture the name of the Wireless LAN Controller (WLC) that the AP is attempting to join. The CAPWAP discovery and join process involves the AP sending discovery requests to find a WLC, and the WLC's…

WLAN Troubleshooting Methods

Question

You are analyzing a CAPWAP join request from an AP. Which information can you capture?

Options

  • AAP hardware and software version
  • Bif the AP is using 2.4 or 5 Ghz band
  • CAP broadcast channel
  • Dname of the WLC

How the community answered

(42 responses)
  • A
    7% (3)
  • B
    2% (1)
  • C
    2% (1)
  • D
    88% (37)

Why each option

When analyzing a CAPWAP join request from an Access Point (AP), you can capture the name of the Wireless LAN Controller (WLC) that the AP is attempting to join. The CAPWAP discovery and join process involves the AP sending discovery requests to find a WLC, and the WLC's identity is part of this communication.

AAP hardware and software version

While the AP hardware and software version are communicated to the WLC after a successful join, they are not typically found within the initial CAPWAP join request itself, but rather exchanged in subsequent control messages.

Bif the AP is using 2.4 or 5 Ghz band

The CAPWAP join request itself does not indicate whether the AP is currently using the 2.4 or 5 GHz band, as this relates to its radio operations which are configured and managed by the WLC post-association.

CAP broadcast channel

An AP's broadcast channel is a detail of its radio operation for client communication, which is determined and configured by the WLC after the AP has successfully joined, not something present in the initial join request.

Dname of the WLCCorrect

During the CAPWAP discovery and join process, the AP and WLC exchange messages that include identifying information. The AP sends discovery requests, and when a WLC responds, its name (system name) is typically included in the CAPWAP control messages, allowing an analyst to identify which WLC the AP is trying to communicate with. This information is crucial for understanding the AP's target controller during the join phase.

Concept tested: CAPWAP join process - information exchange

Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/m_cisco_capwap_introduction.html

Topics

#CAPWAP#AP join process#Packet analysis

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