RUCKUS Wi--Fi Planner is a predictive site survey tool that simulates RF (Radio Frequency) propagation to estimate wireless coverage and performance. For an accurate simulation, the tool requires two fundamental types of input: information about the RF source and information about the environment. The AP model selection (A) defines the RF source's characteristics, including its antenna patterns, transmit power, and supported frequencies. The building wall materials (C) define the environment's impact on RF signals, as different materials cause different levels of signal attenuation, which is critical for predicting signal strength throughout the building.

B. DHCP server IP: This is a Layer 3 network configuration that assigns IP addresses to clients. It has no impact on RF signal propagation and is not used in predictive modeling.

D. DNS server address: This is a Layer 3 network service for name resolution. It is irrelevant to the physical layer characteristics modeled by a predictive RF planning tool.

E. Controller cluster size: This relates to the network's management and control plane scalability and redundancy. It does not influence the RF propagation characteristics of individual APs in a predictive model.

1. RUCKUS Wi-Fi Planner for SmartZone and Cloud Wi-Fi User Guide, Release 3.6.2:

Reference for A (AP model selection): In the section "Placing and Configuring APs," the guide states, "Select an AP model from the AP Model drop-down list." The subsequent heatmaps and coverage analysis are directly based on the selected model's specific RF properties. (Page 21)

Reference for C (Building wall materials): The section "Drawing Walls" details the process of defining environmental obstacles. It explains, "You can select from a list of pre-defined wall types, or create your own custom wall types and specify their attenuation values." This is a core step in modeling the physical environment. (Page 18)

2. RUCKUS Certified Wireless Administrator (RCWA) 100 Study Guide:

The module on "Site Survey and Planning" emphasizes that predictive designs rely on accurate floor plan data, including scaling and the identification of attenuation sources like walls, doors, and windows. It also specifies that selecting the intended AP model is crucial for the software to apply the correct antenna patterns and power levels to the simulation. (Chapter 3: Site Survey and Planning)