Enabling Roaming Recommendations for VoWLAN Clients

300-425 By islever Editorial Last updated

Short answer

D Enable 802.11v BSS Transition Management on the VoWLAN SSID to provide roaming recommendations.

Question

A customer has a Cisco wireless network that supports VoWLAN services. The customer wants supported voice clients to receive roaming recommendations and suggestions from APs. This functionality must not impact non-VoWLAN clients. What should be enabled on the VoWLAN SSID?
  1. 802.11r Fast Transition
  2. 802.11k neighbor lists
  3. CCKM with 802.1X
  4. 802.11v BSS Transition Management Correct Answer

Key Takeaways

The exam tests the distinction between neighbor discovery (802.11k) and active roaming assistance/suggestions (802.11v), with the common trap being the selection of 802.11k which only provides lists rather than direct transition management.

This question addresses the specific IEEE standard used to provide roaming recommendations and suggestions from Access Points to voice clients without impacting other traffic types. The correct configuration enables BSS Transition Management on the VoWLAN SSID.

Common mistake: Candidates often select 802.11k because it provides neighbor lists, but they overlook that 802.11v is specifically required for the 'recommendations' and 'suggestions' aspect of roaming decisions, particularly for seamless handoffs in VoWLAN environments.

Expert Analysis

Why the Answer Is Correct

Option D is correct because IEEE 802.11v defines BSS (Basic Service Set) Transition Management, which allows an AP to send steering frames or recommendations to a client suggesting it roam to a different AP. This is crucial for VoWLAN to ensure call continuity by proactively managing the transition before the link degrades, effectively providing the 'roaming recommendations' specified in the scenario.

Why the Other Options Are Wrong

Option A (802.11r) handles fast key turnover to reduce latency during roaming but does not provide the initial recommendation or suggestion to roam. Option B (802.11k) provides a neighbor list to help clients find neighboring APs faster, but it is passive information; it does not actively suggest a transition like 802.11v does. Option C (CCKM) is a Cisco proprietary mechanism for faster roaming on WPA-Enterprise networks, but it is largely superseded by standards-based approaches and does not inherently provide the 'recommendation' functionality described.

Community Comment Notes

Community consensus strongly favors 802.11v as the correct answer. One user noted that 802.11v is the right choice for this specific requirement. Another comment highlighted that while 802.11k suggests candidate APs, the explicit goal of providing roaming recommendations aligns best with 802.11v capabilities. There was some confusion regarding 802.11k, but the distinction between 'neighbor lists' and 'transition management' clarified the decision.

Official Reference

https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/enterprise-mobility-8-1-design-guide/Chapter-11.html

This link opens the official vendor documentation in a new tab.

Exam Strategy

When a question mentions 'roaming recommendations', 'steering', or 'transition management', think immediately of 802.11v. If it mentions 'neighbor lists' or 'scan offloading', think 802.11k. Do not confuse the two; 802.11k helps you find neighbors, 802.11v tells you where to go.

Frequently Asked Questions

What is the difference between 802.11k and 802.11v?

802.11k provides neighbor lists to help clients scan efficiently, while 802.11v provides BSS Transition Management to actively recommend or steer clients to better APs.

Does 802.11r support roaming recommendations?

No, 802.11r focuses on fast security key transitions to reduce roaming latency, not on the decision-making process of which AP to roam to.

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Community Votes

D
67%
B
33%

67% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 5 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 5

  1. crabb63 👍 4 Answered D
    https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/www.cisco.com/content/en/us/td/docs/wireless/controller/8-1/Enterprise-Mobility-8-1-Design-Guide/Enterprise_Mobility_8-1_Deployment_Guide/Chapter-11.html.xml
  2. gargionifabio 👍 2 Answered B
    ccnp-enwlsd pag 178 optimizing with 802.11k - "as long client also supports 802.11k, the APs and controllers can interact with it to SEGGEST the need roam, as well as a list of know-good candidate APs it can roam to." Answer:D
  3. 55f2ace 👍 1 Answered C
    Cisco Centralized Key Management (CCKM) provides for faster client roaming for Extensible Authentication Protocol (EAP)-authenticated client, which benefits call quality.
  4. cryptonite 👍 1 Answered A
    802.11r can be done in one WLAN SSID.
  5. Farhad123 👍 3
    802.11v is the right choice

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