ExamGecko
Question list
Search
Search

Question 44 - D-ISM-FN-23 discussion

Report
Export

An Ethernet switch has eight ports and all ports must be operational for 24 hours from Monday through Friday.

However, a failure of Port 7 occurs as follows:

Monday=4 PM to 11 PM

Wednesday= 2 PM to 10 PM

Friday= 5 AM to11 AM

What is the MTTR of Port 7?

A.
36 hours
Answers
A.
36 hours
B.
5 hours
Answers
B.
5 hours
C.
7 hours
Answers
C.
7 hours
D.
33 hours
Answers
D.
33 hours
Suggested answer: C

Explanation:

To calculate MTTR, we need to convert the hours into minutes. Here are the steps:

Monday: Port 7 was down from 4 PM to 11 PM. That's 7 hours or 420 minutes.

Wednesday: Port 7 was down from 2 PM to 10 PM. That's 8 hours or 480 minutes.

Friday: Port 7 was down from 5 AM to11 AM. That's 6 hours or 360 minutes.

Total corrective maintenance time = 420 + 480 + 360 =1260 minutes

Number of repairs =3

MTTR = Total corrective maintenance time / Number of repairs

MTTR =1260 / 3 =420 minutes

Therefore, the MTTR of Port 7 is420 minutes.

asked 16/09/2024
Bob Hanselman
37 questions
User
Your answer:
0 comments
Sorted by

Leave a comment first