Which of the following wireless standards uses frequencyhopp

Which of the following wireless standards uses frequency-hopping spread spectrum (FHSS) by default?

A. Bluetooth

B. 802.11a

C. 802.11b

D. 802.11g

Solution

A. Bluetooth uses frequency-hopping spread spectrum (FHSS). FHSS functions by modulating the data with a narrowband carrier signal that hops in a random but predictable sequence from frequency to frequency. Bluetooth can be susceptible to blue jacking and other forms of attack. Answer B is incorrect because 802.11a uses orthogonal frequency-division multiplexing. Answer C is incorrect because 802.11b uses direct sequence spread spectrum (DSSS) technology. Answer D is incorrect because 802.11g also uses orthogonal frequency-division multiplexing.