A network administrator is troubleshooting an enterprise wireless network in a multi-story office building. Employees carrying laptops along hallways report brief disconnections and video call freezes when moving between adjacent Access Points (APs). A site survey indicates that AP transmit power is set to maximum on all units (), whereas client devices transmit at around . Furthermore, seamless roaming protocols are currently unconfigured. Which of the following statements correctly identify a root cause or a proper remediation step for this issue? (Select TWO.)
- The APs' high transmit power causes sticky client behavior, because clients detect a strong downlink signal from distant APs and fail to roam to closer APs; reducing AP transmit power will resolve this.Answer
- Enabling 802.11r (Fast BSS Transition) on the wireless controller will reduce re-authentication latency during inter-AP roaming.Answer
- CConfiguring neighboring APs on the 2.4 GHz band to use channels 2, 4, and 6 will eliminate co-channel interference while maintaining signal continuity.
- DRe-enabling legacy 802.11b basic data rates (1 Mbps and 2 Mbps) across all APs will increase coverage radius and force faster roaming decisions.
Answer
The connection drops during roaming are caused by power asymmetry (sticky clients) and the lack of fast-roaming standards. The issue is resolved by reducing AP transmit power to match client capabilities and enabling 802.11r Fast BSS Transition.
Excessive AP transmit power creates coverage asymmetry where client devices perceive a strong signal from a distant AP and refuse to roam to a closer AP (sticky client). Lowering AP power aligns downlink and uplink boundaries. Additionally, enabling 802.11r (Fast BSS Transition) allows handshakes to complete prior to AP transitions, preventing re-authentication delays.
Step-by-Step Solution
Key Concept
Wireless Roaming Optimization and Power Matching