CWNA Wireless Network Administrator

Answer - B - The reason that DSSS channels are more susceptible to narrowband interference than FHSS channels is that FHSS systems only use one frequency at a time, so the narrowband interference must be on the same exact frequency at the same time.

Key Takeaway: DSSS combines the information signal with a spreading signal having much wider bandwidth. The net modulation signal effectively handles the wide bandwidth of the spreading signal. With FHSS the information is left unchanged and a carrier of varying frequency is directly modulated. This approach is a collection of conventional narrowband signals, hence FHSS is less susceptible to narrowband interferece