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Juniper Exam JN0-251 Topic 12 Question 30 Discussion

Actual exam question for Juniper's JN0-251 exam
Question #: 30
Topic #: 12
[All JN0-251 Questions]

Referring to the exhibit, what do you determine about the site's Time to Connect SLE metric?

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Suggested Answer: B

According to the Wikipedia article on dBm1, a 10 dB increase in level is equivalent to a ten-fold increase in power, and a 10 dB decrease in level is equivalent to a ten-fold decrease in power. Therefore, a 3 dB change in level is approximately equivalent to doubling or halving the power.

In this scenario, the signal strength has changed from -70 dBm to -73 dBm, which is a 3 dB decrease in level. This means that the signal strength has halved, or decreased by 50%. To calculate the ratio of the signal strengths, we can use the following formula:

fracP1P2=10fracx1x210

where P1 and P2 are the powers in mW, and x1 and x2 are the levels in dBm. Plugging in the values from the scenario, we get:

fracP1P2=10frac70(73)10=10frac310approx1.995

This means that the power at -70 dBm is about 2 times higher than the power at -73 dBm, or equivalently, the power at -73 dBm is about 0.5 times lower than the power at -70 dBm.


by Garry at May 19, 2024, 09:53 AM

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Margo
10 months ago
Ah, the age-old dB vs linear units debate. Option D is the obvious choice here, unless you're an audiophile who thinks a 3 dB change is the end of the world.
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Alba
11 months ago
You know, if this was a radio station, a 3 dB decrease would be enough to make me switch the channel. Guess I'll have to go with option D on this one.
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Nohemi
10 months ago
Yeah, I agree. Option D seems like the most logical choice in this situation.
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Felicia
10 months ago
I think you're right, a 3 dB decrease is significant.
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Ardella
11 months ago
Hold up, I thought signal strength was measured in dB, not linear units. So it's not a 10x increase or decrease, it's just a change in dB. Option D seems to be the way to go.
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Yuki
11 months ago
Hmm, 3 dB decrease? That's hardly a 10x change in signal strength. I guess option B is out of the question.
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Corrina
11 months ago
Well, the question states that the signal strength changed from -70 to -73 dBm, so that's a decrease of 3 dB. Option D is clearly the correct answer here.
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Jean
10 months ago
Yes, you're right. It decreased by 3 dB.
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Emogene
10 months ago
I think the signal strength has halved.
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