Wireless Frequencies

Question 1

DSSS

Answer 1

Direct Sequence Spread Spectrum - Modulates data over an entire range of frequencies known as chips. They are more susceptible to environmental interference and use entire frequency spectrum to transmit

Question 2

802.11b Frequency

Answer 2

DSSS

Question 3

FHSS

Answer 3

Frequency Hopping Spread Spectrum - Devices hop between predetermined frequencies. This increases security as hops occur based on a common timer.

Question 4

OFDM

Answer 4

Orthogonal Frequency Division Multiplexing - Uses slow modulation rate with simultaneous transmission of data over 52 data streams. This allows for higher data rates while resisting interference between data streams.

Question 5

802.11n and 802.11g/n Frequency type

Answer 5

OFDM

Question 6

Best 3 channels for 2.4 GHz wireless

Answer 6

1,6,11

Question 7

CSMA/CA

Answer 7

Carrier Sense Multiple Access/Collision Avoidance - Listens for transmission to determine if it is safe to transmit