A network architect is designing a redundancy solution for a customer and has learned that there
is a single link between two critical network components. During the past 4000 hours of operation,
the link has failed twice. The customer estimates that each failure has taken two hours to resolve.
Given this information, what is the availability that this link currently provides?
A.
Less than 99.99%
B.
99.9%
C.
99.99%
D.
99.999%
Answer is B
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B is Correct-
100% geteilt durch 4000= 0,025
0,025 mal 3996=99,9% (4000 Stunden minus 2*2 Stunden Ausfall=3996 Stunden)
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A
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Because the time to recover is an estimate, you can’t say for certain it is exactly 99.9.
ALSO, 99.9 is less than 99.99 anyway, so A should be the right answer.
The formula is MTBF/(MTBF+MTTR)
Here, MTBF = 2000, MTTR = 2
So, 2000/2002 = .999009990099900999
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A is right , since
99.9% Three Nines equals to 43 minutes and 12 seconds downtime
99.99% Four Nines equals to 4 minutes 19 seconds downtime
99.999% Five Nines equals to 26 seconds downtime
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