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71.
Which of the following wireless IEEE standards operate on the 2.4GHz radio frequency
and are directly compatible with each other? (Choose two.)
- A.802.11a
- B.802.11b
- C.802.11d
- D.802.11g
- Answer & Explanation
- Report
Answer : [B, D]
Explanation :
Explanation :
| Both 802.11b and 802.11g operate in the 2.4GHz range and use similar transmission standards. Many devices on the market are listed as 802.11b/g, meaning they will work with either system. Alternatively, 802.11a operates in the 5GHz range. Finally, 802.11d is not a commonly implemented standard. |
72.
What is the primary function of the SSID?
- A.Secure communication between a web server and browser
- B.Secure communication between a server and remote host
- C.A type of password used to help secure a wireless connection
- D.A type of password used to secure an Ethernet 802.3 connection
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| A service-set identifier (SSID) is the unique name given to the wireless network. All hardware that is to participate on the network must be configured to use the same SSID. Essentially, it is the network name. When you are using Windows to connect to a wireless network, all available wireless networks will be listed by their SSID. |
73.
Which two of the following are standards for cellular communications?
- A.GSM
- B.SIG
- C.CDMA
- D.CCFL
- Answer & Explanation
- Report
Answer : [A,C]
Explanation :
Explanation :
| The Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA) are cellular standards. A SIG is a special interest group, and cold cathode fluorescent lamp (CCFL) is a backlight on a laptop. |
74.
What is the most secure wireless encryption standard for 802.11 networks?
- A.WEP
- B.WPA
- C.WPA2
- D.SAFER+
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| WEP was the original encryption standard developed for WiFi networks, but it is easily hacked. WPA is an upgrade, but WPA2 is more secure and incorporates the entire 802.11i standard. SAFER+ is used to encrypt Bluetooth communications. |
75.
What level of QoS is designated for interactive voice and video?
- A.1
- B.4
- C.5
- D.6
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| QoS level 5 is designated for interactive voice and video, with less than 100ms delay. Level 1 is for background applications and is low priority. Level 4 is known as controlled load, which is lower priority than interactive voice and video. Level 6 only has 10ms latency but is reserved for control traffic. |
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