Certified Information Systems Security Professional (CISSP) Practice Exam 2025 – All-in-One Guide to Mastering Your Certification!

The key feature of Direct Sequence Spread Spectrum (DSSS) technology is spreading the signal across the entire band. DSSS works by taking the original data signal and multiplying it by a pseudo-random noise (PN) sequence, which increases the bandwidth of the transmitted signal. This spreading process allows the signal to occupy a wider frequency range, which enhances its resistance to interference and increases security against eavesdropping.

By spreading the signal, DSSS can provide improved performance in environments with high levels of noise or jamming, as well as higher resilience against multipath fading. The wideband nature of DSSS means that even if part of the spectrum is interfered with, the rest of the signal can still be received reliably, improving overall communication quality.

In contrast, the other methodologies do not pertain to DSSS's primary mechanism. Using a single frequency characterizes narrowband communication, while utilizing a frequency-hopping method relates to Frequency Hopping Spread Spectrum (FHSS), which transmits over multiple frequencies in a specific sequence. Employing time division for access touches on Time Division Multiple Access (TDMA), which manages access through time slots rather than frequency spreading.