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NCOI IT INFRASTRUCTUUR - H4 AVAILABILITY CONCEPTS EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED GRADED A+ LATEST UPDATED CA$13.97   Add to cart
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NCOI IT INFRASTRUCTUUR - H4 AVAILABILITY CONCEPTS EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED GRADED A+ LATEST UPDATED
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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 ...

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  • July 23, 2024
  • 15
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • ncoi it infrastructuur h4 availability concepts

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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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