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Exam DEA-1TT4 topic 1 question 113 discussion

Actual exam question from Dell's DEA-1TT4
Question #: 113
Topic #: 1
[All DEA-1TT4 Questions]

An Ethernet switch has eight ports and all ports must be operational for 24 hours; from Monday through Friday. However, a failure of Port 5 occurs as follows:
✑ Tuesday = 6 AM to 7 AM
✑ Thursday = 5 PM to 9 PM
✑ Friday = 8 AM to 9 AM
What is the MTBF of Port 5?

  • A. 30 hours
  • B. 32 hours
  • C. 40 hours
  • D. 38 hours
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Suggested Answer: C 🗳️
Reference:
https://www.sqconline.com/mtbf-calculator-results
by Peach2021 at Feb. 2, 2021, 4:34 p.m.

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Peach2021
Highly Voted 3 years, 11 months ago
D. 38 hours
upvoted 10 times
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nhejo2012
Highly Voted 3 years, 6 months ago
Prod time : 24x5 = 120h Down time : Tuesday = 1 + Thursday = 4 + Friday = 1 Total = 6h Meam Time Between Failures (MTBF) : Total uptime (ProdTime - DownTime) / Number of failures (Tuesday,Thursday,Friday) (120-6) / 3 114 / 3 = 38h Mean Time To Repair (MTTR) : DownTime / Number of failures 6 / 3 = 2h
upvoted 5 times
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gamalaa
Most Recent 2 years, 2 months ago
Selected Answer: D
Meam Time Between Failures (MTBF) : Total uptime (ProdTime - DownTime) / Number of failures (120-6) / 3 114 / 3 = 38h
upvoted 1 times
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Wildpig
3 years, 5 months ago
D38, see lab for more
upvoted 1 times
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Saeid
3 years, 7 months ago
How you calculate total uptime?
upvoted 1 times
Expert2000
3 years, 1 month ago
24 hours * 5 days = 120 120 - 6 = 114
upvoted 1 times
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suzcz
3 years, 8 months ago
114 (total uptime)/3 (no. of failures) =38 hrs
upvoted 1 times
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dotnen
3 years, 10 months ago
D• MTBF = Total uptime / Number of failures
upvoted 2 times
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eddb
3 years, 11 months ago
MTBF = # of operational hours ÷ # of failures (24+24+23+23+20)/3
upvoted 3 times
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