1. Which of the following modulation techniques rapidly switches a signal among frequency channels?
- DSSS
- FHSS
- OFDM
- OFDMA
Explanation: FHSS transmits radio signals by rapidly switching a carrier signal among many frequency channels.
2. Which of the following modulation techniques spreads a signal over a larger frequency band?
- DSSS
- FHSS
- OFDM
- OFDMA
Explanation: DSSS is a modulation technique designed to spread a signal over a larger frequency band.
3. Which of the following modulation techniques is used in the new 802.11ax standard?
- DSSS
- FHSS
- OFDM
- OFDMA
Explanation: The new 802.11ax uses a variation of OFDM called Orthogonal frequency-division multiaccess (OFDMA).
4. How many channels are available for the 2.4 GHz band in Europe?
- 11
- 13
- 14
- 24
Explanation: There are 13 channels in the 2.4 GHz band in Europe (11 channels in North America and 14 bands in Japan).
5. How many channels are available for the 5 GHz band?
- 11
- 13
- 14
- 24
Explanation: There are 24 channels in the 5 GHz band.