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- CWTS PW0-071
16.
Point-to-point links typically use which antenna types? (Choose 2.)
- A.Semidirectional
- B.Omnidirectional
- C.Highly directional
- D.Long-range omnidirectional
- Answer & Explanation
- Report
Answer : [A, C]
Explanation :
Explanation :
| Semidirectional and highly directional antennas are used for point-to-point links. Omnidirectional antennas are for point-to-multipoint links. Long-range omnidirectional antennas do not exist. |
17.
Point-to-multipoint links consist of __________ or more connections.
- A.Two
- B.Three
- C.Four
- D.Five
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Point-to-multipoint links typically have three or more connections. |
18.
IEEE 802.11n devices use an enhanced radio technology known as multiple-input multipleoutput
(MIMO). Which statement correctly describes a benefit of MIMO?
- A.MIMO uses reflections to allow for increased throughput.
- B.MIMO rejects reflections to allow for increased throughput.
- C.MIMO uses a single radio with diversity technology for increased throughput.
- D.MIMO rejects data rates less than 54 Mbps for increased throughput.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| MIMO can use refl ections due to the multiple radio chain technology. Refl ections will hurt throughput in a single-input single-output (SISO) technology. Antenna diversity is used with SISO to lessen the effects of refl ections. |
19.
What organization is responsible for unlicensed frequency band regulation in the United
States?
- A.ETSI
- B.Wi-Fi Alliance
- C.IEEE
- D.FCC
- E.WPA
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The FCC is the local regulatory authority responsible for frequency regulation in the United States. ETSI is a European standards organization responsible for producing standards for information and communications technologies. The Wi-Fi Alliance is an interoperability testing organization. The IEEE creates standards, and WPA is a pre- 802.11 certifi cation by the Wi-Fi Alliance. |
20.
IEEE 802.11g WLANs operate in what frequency range?
- A.900 MHz
- B.5.15–5.25 GHz
- C.5.25–5.35 GHz
- D.2.4–2.5 GHz
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| 802.11g LANs operate in the 2.4–2.5 GHz ISM band. 900 MHz is not used with 802.11 wireless LANs, and 5 GHz is for 802.11a. |
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