- Home
- Networking
- CCNA Wireless
21.
Which one of the following correctly specifies the maximum theoretical data rate of
the 802.11b, 802.11a, and 802.11n standards, respectively?
- A.11 Mbps, 54 Mbps, 600 Mbps
- B.54 Mbps, 54 Mbps, 150 Mbps
- C.1 Mbps, 11 Mbps, 54 Mbps
- D.11 Mbps, 20 Mbps, 40 Mbps
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The maximum theoretical data rate of 802.11b is 11 Mbps, 802.11a is 54 Mbps, and 802.11n is 600 Mbps. |
22.
A 2×3 MIMO device correctly describes which one of the following?
- A.A device with two radios and three antennas
- B.A device with two transmitters and three receivers
- C.A device with two bonded channels and three spatial streams
- D.A device with two receivers and three transmitters
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The device has two transmitters and three receivers. The number of spatial streams supported would be added after the 2×3 designation. |
23.
An 802.11n device can aggregate channels to which one of the following maximum
widths?
- A.5 MHz
- B.20 MHz
- C.40 MHz
- D.80 MHz
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| 802.11n is limited to aggregating two 20-MHz channels for a total width of 40 MHz. |
24.
Which one of the following standards can make use of multiple spatial streams on a
transmitter and a receiver? (Choose all that apply.)
- A.802.11n
- B.802.11b
- C.802.11g
- D.802.11a
- E.802.11ac
- F.All of these answers are correct.
- Answer & Explanation
- Report
Answer : [A][E]
Explanation :
Explanation :
| Devices using 802.11n or 802.11ac can use multiple radio chains and multiple spatial streams. |
25.
Which one of the following is the highest or best modulation scheme that can be
used with 802.11ac devices?
- A.QPSK 3/4
- B.256-QAM
- C.128-QAM
- D.64-QAM
- E.16-QAM
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The 802.11ac amendment supports 256-QAM in both Wave 1 and Wave 2. |
|
|
||||||||||||||||||||||||||||
