RCWA Exam Dumps - RUCKUS High-stakes Industry Certifications Questions and Answers

When configuring an802.1X-secured WLAN, RUCKUS systems such asSmartZone,RUCKUS One, orRUCKUS Cloudtypically rely on anexternal RADIUS serverfor user authentication. However, in the event of acontroller failure or connectivity loss to the RADIUS server,RUCKUS APs can continue to authenticate users locally if thelocal user databaseis enabled and configured.

TheLocal Authentication Databaseallows APs or controllers to store a limited set of credentials that can be used when external AAA services are unavailable. This ensurescontinued access and redundancyfor critical WLANs without requiring external dependency. According toRUCKUS One Online Help – WLAN Configuration and AAA Settings, enabling theLocal Authentication Databaseprovides fallback authentication for 802.1X clients during system or connectivity failures.

In contrast, theproxyandnon-proxymodes define how authentication requests are relayed to the RADIUS server, whileDynamic PSK (DPSK)is a separate authentication method that replaces 802.1X with per-user keys.

TheNoise Floor Levelrepresents the background RF interference in dBm, which directly affects theSignal-to-Noise Ratio (SNR)and overall connection stability.

As stated inRUCKUS One Online Help – RF Diagnostics, an elevated noise floor (e.g., higher than -85 dBm) can indicate interference from devices such as wireless cameras or radar systems.

RUCKUS Analytics 3.5 User Guide – RF Metrics Dashboardhighlights that tracking the noise floor is essential for differentiating between weak coverage and interference-based issues.

Retransmissions and retries are symptoms, while thenoise flooridentifies the root cause.

MIMO (Multiple Input, Multiple Output)is a fundamental wireless technology that enhances Wi-Fi throughput and reliability by transmitting multiple data streams simultaneously using multiple antennas on both the transmitter and receiver. It wasintroduced in the IEEE 802.11n standard, which marked the beginning of high-throughput (HT) Wi-Fi.

According toRUCKUS One Online Helpand theRUCKUS Analytics 3.5 User Guide, MIMO enablesspatial multiplexing,diversity gain, andbeamforming, allowing higher data rates and improved signal quality in multipath environments. Subsequent standards (802.11ac and 802.11ax) expanded this concept toMU-MIMO (Multi-User MIMO), allowing simultaneous communication with multiple clients.

MIMO requiressupport on both the AP and clientfor full functionality; otherwise, the connection falls back to single-stream operation. It is used in bothuplink and downlinkdirections (especially in Wi-Fi 6 and later). Thus, optionB—introduced in 802.11n—is correct, while options A, C, and D are incorrect.

Cloud Auto-Upgradeis a RUCKUS One feature that automatically updates AP firmware to the latest stable release without requiring manual scheduling.

According toRUCKUS One Online Help – Firmware and Lifecycle Automation, this capability ensures security compliance and performance optimization across managed APs. Administrators can opt in or out of automatic updates per site or organization.

SmartZoneuses manual scheduling viaImage Management, whileRUCKUS Oneprovideshands-free upgradesintegrated into its cloud management platform.

TheWi-Fi Alliance (WFA)is the global organization responsible fortesting and certifying interoperabilityof wireless LAN products based on the IEEE 802.11 standards. While theIEEEdevelops and maintains the technical specifications (e.g., 802.11a/b/g/n/ac/ax), it doesnotperform certification or compliance testing. Instead, the Wi-Fi Alliance ensures that certified devices from different manufacturers operate together seamlessly under the“Wi-Fi CERTIFIED™”program.

According toRUCKUS One Online Helpand theRUCKUS AI documentation, RUCKUS access points and controllers undergo Wi-Fi Alliance certification to ensure compatibility with a wide range of client devices, including those using WPA3, Wi-Fi 6 (802.11ax), and Wi-Fi 6E technologies. This certification is critical for enterprise environments where heterogeneous client ecosystems exist.

TheIETFfocuses on internet protocols (e.g., IP, TCP), and theISOhandles broader international standards, not wireless interoperability. Therefore, theWi-Fi Allianceis the correct organization ensuring cross-vendor interoperability for Wi-Fi.

In high-density environments such as stadiums or auditoriums,ceiling height and materialdirectly influencesignal propagation, attenuation, and AP coverage patterns.

As defined inRUCKUS One Online Help – High-Density Wi-Fi Design Guidelines, proper AP placement and downtilt must account for ceiling height and reflective surfaces to avoid co-channel interference and ensure sufficient SNR for every seat zone.

RUCKUS Wi-Fi Planner includes modeling tools for line-of-sight optimization and reflective surface analysis. DHCP and VLAN configurations affect logical segmentation but not physical RF propagation.

Ahidden node problemoccurs when two or more client devices are within range of the AP butcannot hear each other, causing frame collisions that lead to degraded performance.

According toRUCKUS One Online Help – RF Interference and Hidden Node DetectionandRUCKUS AI Documentation – Airtime Efficiency Analysis, the symptoms include:

(A) Retransmissions:Frequent retries due to undetected collisions.

(D) Reduced throughput:Effective throughput decreases as airtime is wasted on retransmissions and ACK delays.

The issue is common in high-density or obstructed environments. EnablingRTS/CTSorBeamFlex+can mitigate it by improving communication coordination.

“Channel changes” occur in interference mitigation, not hidden-node detection; “Excessive roaming” and “Increased Tx power” are unrelated effects.

RUCKUS Wi-Fi Planner (Wi-R Planner)is a predictive design tool that helps plan AP placement and coverage before physical deployment. It relies on environmental and hardware data to simulate accurate RF propagation.

According toRUCKUS One Online Help – Wi-Fi Planner Configuration, essential inputs include:

AP model selection (A):Determines transmit power, antenna gain, and coverage pattern.

Building wall materials (C):Define RF attenuation and signal propagation characteristics.

Parameters likeDHCP/DNS settingsorcontroller cluster sizeare not required for predictive modeling—they’re part of post-deployment configuration.

ARUCKUS Application Policyallows administrators to control network performance and user experience by classifying, prioritizing, and managing traffic based on the type of application detected on the network.

According toRUCKUS One Online Help – Application Control and Policy Management, andRUCKUS AI documentation, Application Policies can:

Apply rate limiting (A):Control the bandwidth allocated to specific applications or application groups (e.g., limit video streaming or social media traffic).

Apply Quality of Service (E):Mark or prioritize application traffic using DSCP or internal QoS levels to ensure latency-sensitive applications such as voice or conferencing receive higher priority.

RUCKUS leveragesDeep Packet Inspection (DPI)for identifying over 2,500+ applications, enabling precise enforcement per SSID or per user.

Other options—URL filtering,VLAN assignment, andpacket capture—are handled through separate mechanisms (Web filtering, Device Policy, and diagnostic tools, respectively), not via Application Policies.

Therefore, the correct answers areA (Rate limiting)andE (Quality of Service).

PD-MRC (Polarization Diversity – Maximal Ratio Combining)is a patented RUCKUS technology that enhances Wi-Fi signal reception bylistening to client transmissions on both the horizontal and vertical polarization planes. This approach helps overcome signal degradation caused by multipath, reflections, and client device orientation.

According to theRUCKUS One Online HelpandRUCKUS AI technical documentation, PD-MRC dynamically selects and combines the signal from both polarization domains to maximize the received signal-to-noise ratio (SNR). This technology works synergistically withBeamFlex, RUCKUS’s adaptive antenna system, to provide optimal signal gain and link reliability per client.

SmartCastis used for traffic prioritization and QoS management,ChannelFlyhandles dynamic channel selection using machine learning, andTx Beamformingoptimizes transmit signal direction. However, none of these specifically analyze both horizontal and vertical planes simultaneously.

Therefore,PD-MRCis the correct answer—it provides improved reception performance and overall RF robustness, especially for mobile clients in variable orientations.