300-425 · Question #311
A hospital needs seamless roaming between APs for wireless medical devices. Which WLAN feature is most critical?
The correct answer is B. Mobility groups. Mobility groups allow multiple Cisco wireless LAN controllers to share client session state, enabling seamless Layer 2 and Layer 3 roaming between APs managed by different controllers.
Question
A hospital needs seamless roaming between APs for wireless medical devices. Which WLAN feature is most critical?
Options
- ADFS channels
- BMobility groups
- CBand Select
- DCleanAir
How the community answered
(33 responses)- A9% (3)
- B70% (23)
- C3% (1)
- D18% (6)
Why each option
Mobility groups allow multiple Cisco wireless LAN controllers to share client session state, enabling seamless Layer 2 and Layer 3 roaming between APs managed by different controllers.
DFS channels enable APs to vacate frequencies occupied by radar systems and are a regulatory compliance mechanism, not a roaming optimization feature.
Mobility groups establish a trust relationship between WLCs so that when a client roams to an AP on a different controller, the original controller tunnels the session to the new controller via an EtherIP or CAPWAP mobility tunnel. This preserves the client's IP address and authentication state, ensuring uninterrupted connectivity for latency-sensitive medical devices.
Band Select influences which radio band a client initially associates to but has no mechanism to maintain session continuity when a client physically moves between APs.
CleanAir addresses RF interference from non-Wi-Fi devices and does not contribute to roaming decisions or client session handoff between APs.
Concept tested: Cisco WLC mobility groups for seamless inter-controller roaming
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/mobility.html
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