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- CWTS PW0-071
61.
IEEE 802.11a/b/g/n devices use what type of communication?
- A.Half diplex
- B.Full diplex
- C.Half duplex
- D.Full duplex
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| IEEE wireless LAN devices use half-duplex communication. Half duplex is defi ned as two-way communication only one way at a time. Wired LANs can use full-duplex communication, which is two-way communication transmitting in both directions simultaneously. An example of duplex is to combine signals from two different frequencies into a single transmitter/receiver. |
62.
HR/DSSS devices operate in which frequency range?
- A.2.400 GHz ISM
- B.5.250 GHz UNII
- C.5.350 GHz UNII
- D.5.750 GHz UNII
- E.5.725 GHz ISM
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| DSSS devices operate in the 2.4 to 2.5 GHz ISM band. OFDM devices operate in the 5 GHz UNII bands. |
63.
How many access points can be co-located without channel reuse in the same radio frequency
area to maximize total system throughput while minimizing RF interference in an
IEEE 802.11g network?
- A.Two
- B.Three
- C.Four
- D.Six
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| 802.11g operates in the 2.4 GHz ISM band. A total of three access points can be co-located before interference becomes an issue. |
64.
Devices compliant with which amendment to the IEEE standard use multiple radio chains
and multiple antennas?
- A.802.11a
- B.802.11b
- C.802.11g
- D.802.11n
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The IEEE 802.11n amendment devices use MIMO, multiple radio chains, and antennas to operate. 802.11a/b/g devices use one radio and may use multiple antennas for diversity. |
65.
What technology is used to send WLAN data over a wireless medium using many subcarrier
frequencies?
- A.Wireless broadband
- B.Narrowband
- C.Spread-spectrum
- D.Spectral masking
- E.Wideband
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Spread-spectrum technology sends data over many subcarrier frequencies. Narrowband technology is not used in IEEE-based WLANs but is used in other technology such as radio and TV. Wireless broadband provides high-speed wireless data communications and wireless Internet over a wide area network. Wideband uses a wide range of frequencies, and spectral mask refers to the signal levels of the radio frequency. |
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