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Exam CWNA-107 topic 1 question 72 discussion

Actual exam question from CWNP's CWNA-107
Question #: 72
Topic #: 1
[All CWNA-107 Questions]

What statement about 802.11 WLAN bridges is true?

  • A. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
  • B. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
  • C. WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band
  • D. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by Superhappyfuntime at Aug. 19, 2020, 8:53 p.m.

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EAG
2 years, 11 months ago
Option A is wrong because WLAN bridges can operate in both 2.4GHz and 5GHz bands. Option C is wrong because MIMO technology was introduced in the 802.11n standard which supports both 2.4GHz and 5GHz frequency bands. Thus MIMO communications can be supported by WLAN bridges operating in either or both frequency bands. Option D is wrong because in reality a WLAN Bridge communication (and every other 802.11-based communication) can never be totally free from RF interference of one kind or another. Thus Option B is the correct answer.
upvoted 4 times
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VladeDivac
3 years, 4 months ago
802.11n indeed uses MIMO, but it could be deployed either at 2.4GHz or 5GHz. I think option B is the only one that fits.
upvoted 1 times
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staffo
3 years, 5 months ago
B is the only one that makes any sense to me.
upvoted 4 times
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Superhappyfuntime
3 years, 8 months ago
Then this is a fictional part. Please report that it's using magic going against WiFi Alliance standards.: https://www.apm.com.tw/mimo-300mbps-outdoor-bridge-2-4ghz-ape-2405mm8.html
upvoted 1 times
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C (25%)
B (20%)
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