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- CWTS PW0-071
21.
Which of the following organizations is responsible for standards compliance?
- A.FCC
- B.ETSI
- C.IEEE
- D.WPA2
- E.Wi-Fi Alliance
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| The Wi-Fi Alliance performs interoperability testing and verifi es standards compliance. 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 IEEE creates standards and WPA2 is a post-802.11 certifi cation by the Wi-Fi Alliance. |
22.
IEEE 802.11a uses which PHY technology?
- A.ERP-OFDM
- B.HR/DSSS
- C.OFDM
- D.FHSS
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| 802.11a uses OFDM; ERP-OFDM is used in 802.11g. HR/DSSS is used with 802.11b and 802.11g. FHSS is specifi ed in the original IEEE 802.11 standard and is obsolete with respect to modern Wi-Fi technology. |
23.
802.11b is capable of which of the following data rates? (Choose 3.)
- A.1 Mbps
- B.6 Mbps
- C.5.5 Mbps
- D.11 Mbps
- E.12 Mbps
- Answer & Explanation
- Report
Answer : [A, C, D]
Explanation :
Explanation :
| 802.11b can use 1, 2, 5.5, and 11 Mbps. 6 and 12 Mbps are OFDM data rates and used in 802.11a and 802.11g networks. |
24.
802.11g is backward-compatible with which of the following IEEE wireless LAN standards?
(Choose 2.)
- A.802.11 DSSS
- B.802.11a OFDM
- C.802.11a ERP-OFDM
- D.802.11b HR/DSSS
- E.802.3af
- Answer & Explanation
- Report
Answer : [A, D]
Explanation :
Explanation :
| 802.11g is backward compatible with DSSS and HR/DSSS. 802.11a OFDM operates in the 5 GHz band. ERP-OFDM is not used in 802.11a technology and 802.3af is for Power over Ethernet (PoE). |
25.
In the 802.11a amendment, the UNII-3 band can be used for which of the following
WLAN applications?
- A.Indoor and outdoor
- B.Outdoor only
- C.Indoor only
- D.The UNII-3 band cannot be used for WLANs.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The UNII-3 band can be used indoors or outdoors, but was at one time mainly used outdoors only. |
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