300-425 · Question #52
A wireless deployment in a high-density environment is being used by vendors to process credit card payment transactions via handheld mobile scanners. The scanners are having problems roaming…
The correct answer is A. RX SOP. RX SOP (Receive Start of Packet) adjusts the minimum signal threshold at which an AP accepts client frames, effectively shrinking cell size to force earlier roaming in high-density environments with mobile devices.
Question
A wireless deployment in a high-density environment is being used by vendors to process credit card payment transactions via handheld mobile scanners. The scanners are having problems roaming between access points in the environment. Which feature on the wireless controller should have been incorporated in the design?
Options
- ARX SOP
- B802.11w
- CAP Heartbeat Timeout
- DApplication Visibility Control
How the community answered
(40 responses)- A75% (30)
- B8% (3)
- C15% (6)
- D3% (1)
Why each option
RX SOP (Receive Start of Packet) adjusts the minimum signal threshold at which an AP accepts client frames, effectively shrinking cell size to force earlier roaming in high-density environments with mobile devices.
RX SOP sets the received signal threshold below which the AP discards incoming frames, reducing the effective coverage cell radius. In a high-density deployment with handheld scanners, raising the RX SOP threshold forces clients to roam to a nearer, stronger AP sooner rather than maintaining a weak connection to a distant one. This directly addresses sticky-client roaming problems common with mobile scanners by making each AP's cell smaller and boundaries more defined.
802.11w provides Management Frame Protection to secure management frames from spoofing and has no influence on client roaming thresholds or cell sizing.
AP Heartbeat Timeout controls the interval at which an AP checks connectivity to the WLC and has no effect on client roaming decisions.
Application Visibility Control identifies and classifies application traffic for QoS or policy enforcement and does not address RF coverage cell behavior or roaming.
Concept tested: RX SOP threshold tuning for high-density client roaming
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/rx_sop.html
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