NCOI IT INFRASTRUCTUUR - H4 AVAILABILITY CONCEPTS EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED GRADED A+ LATEST UPDATED
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NCOI
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NCOI (NCOI)
NCOI IT INFRASTRUCTUUR - H4 AVAILABILITY CONCEPTS EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED GRADED A+ LATEST UPDATED
Is 100% availability possible?
No this is not possible. no matter how much effort is spent on creating high available infrastructures, there is always a chance of downtime
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NCOI IT INFRASTRUCTUUR - H4 AVAILABILITY CONCEPTS EXAM
QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED GRADED
A+ LATEST UPDATED
Is 100% availability possible?
No this is not possible. no matter how much effort is spent on creating high available
infrastructures, there is always a chance of downtime
Can availability be calculated upfront?
No, it can only be reported on afterwards, when a system has run for some years. But
much knowlegde and experience is gained over the years on how to develop high
available systems
What can be used to achieve higher availability?
- Failover
- Redundancy
- Structured programming
- avoiding Single Points of Failure (SPOF)
- implementing sound systems management
How is the availability of a system usually expressed?
as a percentage of uptime in a given time period (usually 1 year or 1 month)
What are typical requirements for availability?
, 99,8% or 99,9% for a full IT system. To meet this, the availability of the underlying
infrastructure must be much higher (>99,99%)
What is carrier grade availability?
99,999% availability. (originates from telecommunication systems that needed
extremely high availability). Higher than this is very uncommon (and almost impossible)
What are other requirements on the availability?
The max downtime per year for example should not occur in 1 event, nor should a short
downtime occur very often. Therefore it is good to agree on the max. frequency of
unavailability. You can use a frequency table. (see blz 54)
What are the factors involved in calculating availability?
- Mean Time Between Failures (MBTF)
- Mean Time To Repair (MTTR)
What is MTBF (mean time between failures)?
The average time that passes between failures
What is MTTR (mean time to repair)?
The time it takes to recover from a failure
what does the word 'mean' mean in MBTF and MTTR?
It means that the numbers expressed by MBTF and MTTR are statistically calculated
values
The MTBF is expressed in....?
hours (how many hours will the component or service work without failure)
How do manufacturers test the MTBF for their components?
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