TheData Interfaceis unique tophysical SmartZone (SZ) hardware appliancessuch as theSmartZone 100 (SZ-100)orSmartZone 300 (SZ-300). This interface handlesuser traffic data forwardingin hardware-based deployments and isnot presentin virtualized versions such as thevSZ (Virtual SmartZone).
According to theRUCKUS One Online HelpandSmartZone system architecture descriptions, the physical controller includes four main interfaces:
* Management Interface:Handles GUI, CLI, and administrative access.
* Control Interface:Manages control-plane communications with access points.
* Cluster Interface:Manages synchronization and redundancy between cluster members.
* Data Interface:Dedicated for data-plane traffic processing and forwarding (exclusive to physical appliances).
Virtual SmartZone controllers usetunnel-based data forwarding(via GRE or VXLAN) instead of a dedicated hardwareData Interface. Hence, theData interfaceexists only on physical appliances, makingAthe correct answer.
References:
RUCKUS One Online Help - SmartZone Controller Network Interfaces
RUCKUS Analytics 3.5 User Guide - Controller Data Plane Monitoring and Interface Metrics RUCKUS AI Documentation - SmartZone Hardware Architecture Overview (docs.cloud.ruckuswireless.com
/RUCKUS-AI/userguide/index.html)

When configuring an 802.1X-secured WLAN, RUCKUS systems such as SmartZone, RUCKUS One, or RUCKUS Cloud typically rely on an external RADIUS server for user authentication. However, in the event of a controller failure or connectivity loss to the RADIUS server, RUCKUS APs can continue to authenticate users locally if the local user database is enabled and configured.
The Local Authentication Database allows APs or controllers to store a limited set of credentials that can be used when external AAA services are unavailable. This ensures continued access and redundancy for critical WLANs without requiring external dependency. According to RUCKUS One Online Help - WLAN Configuration and AAA Settings, enabling the Local Authentication Database provides fallback authentication for 802.1X clients during system or connectivity failures.
In contrast, the proxy and non-proxy modes define how authentication requests are relayed to the RADIUS server, while Dynamic PSK (DPSK) is a separate authentication method that replaces 802.1X with per-user keys.
Reference:
RUCKUS One Online Help - WLAN Configuration: AAA Authentication and Fallback Options RUCKUS Analytics 3.5 User Guide - Client Authentication and WLAN Events Ruckus Cloud / RUCKUS AI Documentation - Authentication Mode Descriptions

InRUCKUS Wi-Fi Planner, definingattenuation valuesfor wall materials enables the simulation ofRF signal lossacross physical barriers such as drywall, concrete, or glass.
According toRUCKUS One Online Help - Wi-Fi Planner RF Modeling, accurate wall attenuation data allows the planner to predict signal propagation and coverage maps with greater accuracy. This ensures optimal AP placement and reduces coverage overlap or dead zones.
TheRUCKUS Analytics 3.5 User Guide - RF Validation Reportsconfirms that modeling real-world materials provides reliable pre-deployment visibility of expected SNR and throughput performance.
Other options-like RSSI thresholds or DHCP zoning-are not part of RF prediction modeling.
References:
RUCKUS One Online Help - RF Prediction and Attenuation Setup
RUCKUS Analytics 3.5 User Guide - Pre-deployment and Validation Reports RUCKUS AI Documentation - Predictive RF Design and Material Modeling

For optimal voice and video performance, RUCKUS recommends maintaining a Signal-to-Noise Ratio (SNR) of 25 dB or higher to ensure a clear, low-latency wireless link.
According to RUCKUS One Online Help - Wi-Fi Quality and SNR Thresholds and RUCKUS AI Documentation - VoIP and Streaming Application Optimization, SNR values above 25 dB correspond to high modulation and coding schemes (MCS8-MCS11 in Wi-Fi 6), supporting stable throughput with minimal jitter or packet loss.
The exhibit shows that the Boardroom maintains an SNR of 28 dB, which exceeds the recommended 25 dB threshold, making it ideal for HD video conferencing and VoIP applications.
Other areas (Office, Breakroom, Warehouse) fall below optimal levels, which can lead to voice dropouts, jitter, and reduced data rates.
RUCKUS Analytics 3.5 User Guide - Client Experience Metrics further validates SNR as a key indicator of real-time application quality.
Reference:
RUCKUS One Online Help - SNR and QoE Performance Standards for VoIP/Video RUCKUS Analytics 3.5 User Guide - Client SNR and MCS Analysis for Application Health RUCKUS AI Documentation - Real-Time SNR Monitoring and SLA Insights

Seamless roaming onRUCKUS WLANsis achieved through support for802.11k,802.11r, and802.11v enhancements, which collectively improve handoff efficiency and reduce latency when clients move between APs.
According toRUCKUS One Online Help - Fast Roaming ConfigurationandRUCKUS AI Documentation
- Client Mobility Optimization, the following statements are true:
* 802.11k (C):Enables APs to provideNeighbor Reportslisting surrounding APs and their channels, allowing clients to make faster and more intelligent roaming decisions.
* 802.11r (D):ImplementsFast BSS Transition (FT), reducing authentication delay during roaming by pre-establishing encryption keys. However, its operation depends on theencryption type-it is supported only withWPA2-Enterprise (802.1X)andWPA2/WPA3-Personalmodes, not open WLANs.
The other options are incorrect: 802.11ac aggregation does not affect roaming; 802.11u supports Hotspot 2.0, not fast transition; and 802.11w (PMF) adds management frame protection, not roaming enhancements.
Thus, the correct answers areC (802.11k neighbor lists)andD (802.11r depends on encryption type).
References:
RUCKUS One Online Help - 802.11k/v/r Roaming Enhancements
RUCKUS Analytics 3.5 User Guide - Client Roaming and Transition Events
RUCKUS AI Documentation - Fast Roaming Optimization and Encryption Dependencies