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Exam 350-401 topic 1 question 854 discussion

Actual exam question from Cisco's 350-401
Question #: 854
Topic #: 1
[All 350-401 Questions]

An engineer measures the Wi-Fi coverage at a customer site The RSSI values are recorded as follows:

• Location A: -72 dBm
• Location B: -75 dBm
• Location C -65 dBm
• Location D -80 dBm

Which two statements does the engineer use to explain these values to the customer? (Choose two.)

  • A. The signal strength at location C is too weak to support web surfing
  • B. Location D has the strongest RF signal strength
  • C. The RF signal strength at location B is 50% weaker than location A
  • D. The RF signal strength at location C is 10 times stronger than location B
  • E. The signal strength at location B is 10 dB better than location C
Show Suggested Answer Hide Answer
Suggested Answer: CD 🗳️
by JackDRipper at Nov. 6, 2023, 6:39 a.m.

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Horsefeathers
Highly Voted 1 year, 4 months ago
Selected Answer: CD
The following matches options C & D perfectly: "For every 3 dB decrease, the power is cut in half. Similarly, every 10 dB increase in level is 10 times the power, and every 10 dB decrease in level results in 1/10 the power. This is sometimes referred to as the “rule of 3s and 10s.”" https://www.sciencedirect.com/topics/computer-science/signal-strength
upvoted 8 times
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kaupz
Highly Voted 1 year, 4 months ago
Selected Answer: CD
C and D(is the closest correct) Because rule of 10 and 3s
upvoted 8 times
kaupz
1 year, 4 months ago
A)-65dBm is enough for web browsing) - wrong https://community.cisco.com/t5/wireless-mobility-knowledge-base/snr-rssi-eirp-and-free-space-path-loss/ta-p/3128478#:~:text=The%20closer%20this%20value%20to,on%20power%20levels%20and%20design. "Typically voice networks require a -65dBm or better signal level while a data network needs -80dBm or better. Normal range in a network would be -45dBm to -87dBm depending on power levels and design" B) the closer the value to + side, the better the signal - wrong
upvoted 2 times
kaupz
1 year, 4 months ago
C) -75dBm is 3dBm weaker than -72dBm, so this divides the coverage with 2 (50% less) D) imagine 2squaremeters equals -80dBm, then if each time the RSSI gets better 3dBm then the the x squaremeters get multiplied with 2. -80dBm = 2sqm -77dBm = 4sqm -74dBm = 8sqm -71dBm = 16sqm -68dBm = 32sqm -65dBm = 64sqm this means not only it is just 10 times stronger, but 32 times. D) Yet again, the closer the value to + side, the better the signal, not the other way around - wrong
upvoted 2 times
kaupz
1 year, 4 months ago
oops - E) Yet again, the closer the value to + side, the better the signal, not the other way around - wrong
upvoted 2 times
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chmacnp
Most Recent 2 months, 4 weeks ago
Selected Answer: CD
C & D - the answer is very clearly not A (-65dBm is considered fair and adequate for surfing), B (D is the weakest not the strongest, & E (the signal strength is 10dB worse than C) leaving option C + D as only viable options
upvoted 1 times
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cjoyce1980
6 months, 2 weeks ago
Selected Answer: CD
The two correct statements based on the RSSI values are: D. The RF signal strength at location C is 10 times stronger than location B This is because a 10 dB difference in RSSI corresponds to a tenfold increase in signal strength. The difference between Location C (-65 dBm) and Location B (-75 dBm) is 10 dB, meaning the signal at Location C is 10 times stronger. C. The RF signal strength at location B is 50% weaker than location A A 3 dB difference corresponds to approximately half the signal strength. The difference between Location B (-75 dBm) and Location A (-72 dBm) is 3 dB, which suggests that the signal strength at Location B is about 50% weaker than at Location A. Explanations for incorrect options: A: The signal strength at -65 dBm (Location C) is typically sufficient for basic web browsing, so this statement is incorrect. B: Location D has the weakest signal strength at -80 dBm, not the strongest, making this statement incorrect. E: The signal strength at Location B is not better than Location C; in fact, it is worse by 10 dB.
upvoted 1 times
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chiacche
7 months, 2 weeks ago
Selected Answer: CD
-3 dBm --> x1/2 +10 dBm --> x10
upvoted 1 times
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[Removed]
11 months ago
Selected Answer: CD
C & D are correct
upvoted 1 times
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Nickita
1 year, 1 month ago
Selected Answer: AB
I'd go for A and B because read carefully - the mission is to explain it to a customer! A customer is non technical most probably and will see these equations as bullshit...
upvoted 1 times
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[Removed]
1 year, 2 months ago
Selected Answer: CD
C and D 100%
upvoted 3 times
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Fanny1493
1 year, 5 months ago
Selected Answer: CD
Correct answer C for descarting wrong A,B,E, ...... then other correct answer D
upvoted 2 times
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JackDRipper
1 year, 6 months ago
Selected Answer: AC
C is 100% correct A is subjective, but the all other choices are wrong, so A and C it is.
upvoted 1 times
adamzet33
1 year, 5 months ago
-65 should be enough for web browsing..
upvoted 2 times
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A (35%)
C (25%)
B (20%)
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