With 200 AP-515 and 75 AP-565 APs deployed and 802.1X authentication in use, which feature should be enabled to ensure the best roaming experience for Wi-Fi calling?

With 200 AP-515 and 75 AP-565 APs deployed and 802.1X authentication in use, which feature should be enabled to ensure the best roaming experience for Wi-Fi calling?

• A. 802.1X
• B. 802.11r
• C. 802.11W
• D. 802.11h

Answer: (A)

For seamless Wi‑Fi calling as users move between APs, the key is reducing roaming latency. Fast BSS Transition, known as 802.11r, is designed exactly for that: it lets a client pre-authenticate with neighboring APs and transfer the cryptographic keys between APs so the handoff becomes a quick re-association rather than a full re-authentication. When 802.1X authentication is already in use, enabling 802.11r works with that security framework to speed up roam without compromising security, which is crucial in a large deployment like 200 AP‑515s and 75 AP‑565 APs. The other options don’t directly address roaming speed. Protected Management Frames (802.11w) improves security of management frames but doesn’t shorten roam time. Regulatory domain handling (802.11h) is about DFS and TPC, not roaming performance. Neighbor reports and some roam optimizations (802.11k) help with roam decisions but don’t provide the fast transition capability that 802.11r offers. So, enabling fast roaming via 802.11r is the best choice to ensure the most reliable roaming experience for Wi‑Fi calling in this environment.

For seamless Wi‑Fi calling as users move between APs, the key is reducing roaming latency. Fast BSS Transition, known as 802.11r, is designed exactly for that: it lets a client pre-authenticate with neighboring APs and transfer the cryptographic keys between APs so the handoff becomes a quick re-association rather than a full re-authentication. When 802.1X authentication is already in use, enabling 802.11r works with that security framework to speed up roam without compromising security, which is crucial in a large deployment like 200 AP‑515s and 75 AP‑565 APs.

The other options don’t directly address roaming speed. Protected Management Frames (802.11w) improves security of management frames but doesn’t shorten roam time. Regulatory domain handling (802.11h) is about DFS and TPC, not roaming performance. Neighbor reports and some roam optimizations (802.11k) help with roam decisions but don’t provide the fast transition capability that 802.11r offers.

So, enabling fast roaming via 802.11r is the best choice to ensure the most reliable roaming experience for Wi‑Fi calling in this environment.