A pre-design site visit in preparation for a predictive wireless LAN design is essential for gathering

physical and environmental data about the site. The key tasks to be performed during such a visit

include:

Evaluating Building Materials: Different materials (concrete, glass, wood, etc.) have varying effects

on RF signal propagation. Understanding the materials present helps in accurately predicting how

signals will behave within the environment.

Floor Plan Verification: Ensuring that the floor plan documents are an accurate representation of the

actual building layout is crucial. Discrepancies between the floor plans and the physical layout can

lead to inaccuracies in the predictive design.

The other options, while potentially valuable in other contexts, are not directly related to preparing

for a predictive design:

Installing APs (option A) for testing co-channel interference is more aligned with an active site survey

rather than a pre-design visit for a predictive design.

Collecting information about security requirements (option B) is important but is not directly related

to the physical aspects of the site that would impact a predictive design.

Testing antenna types (option C) would typically be part of an active site survey or the actual

deployment phase, not a pre-design visit for predictive modeling.

Therefore, option D is the correct answer, focusing on evaluating physical aspects crucial for accurate

predictive modeling.

Reference:

CWNA Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109, by David D.

Coleman and David

A . Westcott.

Best practices for conducting pre-design site visits in wireless network planning.