Certified Wireless Design Professional (CWDP) Practice Exam 2025 - Free CWDP Practice Questions and Study Guide

The correct choice identifies the Physical Layer (PHY) data rates defined by the High Rate Direct Sequence Spread Spectrum (HR/DSSS) standard, which includes rates of 1, 2, 5.5, and 11 Mbps. HR/DSSS was part of the IEEE 802.11b standard and was introduced to provide higher data throughput compared to earlier DSSS specifications.

Understanding the historical context is crucial here. The original DSSS standard only supported 1 and 2 Mbps rates, but HR/DSSS was developed to enhance the wireless LAN's performance by allowing faster transmission speeds of 5.5 and 11 Mbps. Therefore, recognizing these specific rates helps you grasp how wireless technology evolved to support more data-intensive applications.

The other choices reference PHY rates from different standards or groups of data rates not specific to HR/DSSS. For instance, the set of rates given in one option corresponds to the IEEE 802.11a/802.11g standards, which utilize different physical layers and modulation techniques that yield higher rates. Another option, which lists MCS (Modulation and Coding Scheme) values, relates to 802.11n and other OFDM-based standards, which are separate from the HR/D