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WLAN Questions

Created: Feb 9, 2020 16:39:54Latest reply: Feb 11, 2020 16:20:44 692 4 0 0 0
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Which of the following WLAN standards support 5 GHz?
[A] 802.11a
[B] 802.11ac
[C] 802.11g
[D] 802.11b
[E] 802.11i
[F}802.11n
Which of the following formulas about power are incorrect?
[A] 0 dBm = 0 mw
[B] 1 dBm = 1 mw
[C] 0 dBm = 1 mw
[D] 1 dBm = 0 mw
Which of the following statements about WLAN Layer 2 and Layer 3 networking modes are correct?
[A] The Layer 2 networking is easy to deploy
[B] The Layer 3 networking is applicable to small-to-medium-sized networks
[C] The Layer 2 networking is applicable to large-sized networks
[D] The Layer 3 networking is complex to deploy
In 802.11 ELAN, Which of the following are included in the CSMA/CA mechanism?
[A] Carrier sense
[B] Collision detection
[C] Collision avoidance
[D] Multiple access


WLAN

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jason_hu
Admin Created Feb 10, 2020 03:30:51

Hi@CRIS1794,
1.A, WLAN is mainly 802.11b, 802.11a, 802.11g, 802.11n has a total of thirteen channels, working frequency b, g, n2.4ghz, a5.138ghz.

2.ABD, X = 1000000000000000 (how many?) = 10logX = 150 dB

X = 0.000000000000001 = 10logX = -150 dB

dBm is defined as miliwatt. 0 dBm = 10log1 mw;

dBw defines watt. 0 dBw = 10log1 W = 10log1000 mw = 30 dBm.

In the dB, dBm, and dBw calculations, pay attention to the basic concepts. For example, 0dBw = 10log1W = 10log1000mw = 30dBm; another example, when one dBm is subtracted from another dBm, the result is dB. Example: 30dBm-0dBm =

30dB.

3.AD

4.AC, the so-called CSMA / CA mechanism, is a very important mechanism to avoid cut-off access conflicts in the wireless local area network 802.11. The CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) mechanisms is mainly divided into two parts: carrier sense (CSMA) and collision avoidance (CA).
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2#
sohaib.ansar
sohaib.ansar Created Feb 9, 2020 17:11:58

Hi User,
1. A
2. A,B,C
3. A,D
4. A,C
Thanks
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  • x
  • convention：
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3#
jason_hu
jason_hu Admin Created Feb 10, 2020 03:30:51

Hi@CRIS1794,
1.A, WLAN is mainly 802.11b, 802.11a, 802.11g, 802.11n has a total of thirteen channels, working frequency b, g, n2.4ghz, a5.138ghz.

2.ABD, X = 1000000000000000 (how many?) = 10logX = 150 dB

X = 0.000000000000001 = 10logX = -150 dB

dBm is defined as miliwatt. 0 dBm = 10log1 mw;

dBw defines watt. 0 dBw = 10log1 W = 10log1000 mw = 30 dBm.

In the dB, dBm, and dBw calculations, pay attention to the basic concepts. For example, 0dBw = 10log1W = 10log1000mw = 30dBm; another example, when one dBm is subtracted from another dBm, the result is dB. Example: 30dBm-0dBm =

30dB.

3.AD

4.AC, the so-called CSMA / CA mechanism, is a very important mechanism to avoid cut-off access conflicts in the wireless local area network 802.11. The CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) mechanisms is mainly divided into two parts: carrier sense (CSMA) and collision avoidance (CA).
View more
  • x
  • convention：
(0) (0)
4#
Mohy
Mohy Created Feb 10, 2020 04:19:12

1. A and B (if mean support 5Ghz only then it's)
2. A,D
3. A,D
4. A,C
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  • x
  • convention：
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5#
NACA4412
NACA4412 Created Feb 11, 2020 16:20:44

Thanks
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  • x
  • convention：
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