RUCKUS Updated RCWA Exam Questions and Answers by jorge

Themaximum theoretical throughputof a Wi-Fi link is primarily defined by thechannel width(e.g., 20, 40, 80, or 160 MHz) and theModulation and Coding Scheme (MCS) rateselected by the device.

As stated in theRUCKUS One Online Help – PHY and Data Rate Concepts, throughput increases with wider channels and higher modulation (e.g., 1024-QAM in Wi-Fi 6). However, achieving these rates depends on sufficientSNR, which influences the MCS level that can be sustained.

RUCKUS Analytics collects PHY rate metrics to validate link efficiency and helps determine whether MCS downgrades are caused by environmental noise or interference.

Transmit power and beacon timing affect stability, not raw throughput.

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.

When deployingSmartZone-Essentials (SZ-100/SZ-144)forRUCKUS ICX switch management, the switches establish a secure HTTPS-based connection to the controller using theSmartZone registrar IP. A common issue preventing connection occurs whenSmartZone is not configured to accept self-signed certificates—which are typically used by ICX switches by default for initial onboarding.

As described in theRUCKUS One Online Help – SmartZone Switch Management SetupandRUCKUS AI documentation, administrators must explicitly enable the option to“Allow Self-Signed Certificates”in the controller’sSwitch Management settings. Without this configuration, the SmartZone rejects the ICX connection request during SSL/TLS handshake, causing registration failure.

SNMPv3 configuration and DHCP options are unrelated to initial controller registration. Additionally,SmartZone-Essentialsfully supports ICX management;SmartZone High Scaleis not required.

Thus, the correct answer isC— the connection fails because the controller is not set to accept self-signed certificates from the switch.

Indoor WLAN coverageis influenced by multiple RF and physical parameters that determine how effectively a signal propagates and maintains connectivity quality.

According toRUCKUS One Online Help – RF Design FundamentalsandRUCKUS AI Documentation – Coverage Optimization, the three most impactful factors are:

AP Transmit Power (A):Directly affects signal reach; excessive power can cause co-channel interference, while low power results in coverage holes.

AP Orientation (C):Affects signal radiation direction—wall-mounted, ceiling-mounted, or tilted deployments impact pattern uniformity and coverage overlap.

Antenna Pattern (D):Defines gain and directional behavior; omnidirectional antennas provide uniform coverage, while directional models concentrate energy for targeted areas.

Antenna diversityandspatial multiplexingimprove throughput and reliability, but do not primarily determine raw coverage boundaries. “Earth bulge” is irrelevant for indoor deployments.