Which of the following best defines availability in the context of reliability testing?

The number of failures per unit time

The time taken to restore service after a failure

The proportion of time the system is operational and available for use

The average time between failures

An online banking system must be available 99.99% of the time, but the test team has found that the system takes 30 minutes to recover from a failure. The system is expected to have one failure per month. What is the most effective way to meet the availability target?

Increase the availability target to 99.9%.

Reduce the recovery time to less than 5 minutes.

Reduce the number of failures to less than one per year.

Perform more availability testing to confirm the current availability.

A company is developing a new product and must decide how to allocate the reliability testing budget. The product has a high failure rate in early development, but the team expects it to improve over time. The company wants to track reliability growth. Which testing approach is most appropriate?

Conduct only recoverability testing to ensure the system can recover from failures.

Conduct iterative testing cycles, measuring failure intensity after each cycle to track reliability growth.

Conduct a single large test at the end of development to measure the final failure rate.

Conduct only fault tolerance testing to ensure the system can handle faults.

Which of the following is an example of a fault that would be introduced during fault tolerance testing?

Performing a routine software update

Verifying the system's response to a user pressing the 'Enter' key

Testing the system with valid user inputs

Simulating a network cable disconnection

Certified Tester Advanced Level Technical Test Analyst

Domain 4Objective 2

Reliability Testing CTAL-TTA Practice Questions (Page 1)

Part of the Domain 4: Quality Characteristics for Technical Testing domain, which makes up ~14% of our current practice bank. ISTQB does not publish an official question count, but from its 120-minute exam (~50–80 total, ~7–11 in this domain), expect 1–2 from this objective — we provide 20 practice questions to prepare you well beyond it. (estimate)

20questions here

4free pages

6concepts

Questions 1–5

1foundation · easy
Which of the following best defines availability in the context of reliability testing?
Select an answer first
2expert · hard
An online banking system must be available 99.99% of the time, but the test team has found that the system takes 30 minutes to recover from a failure. The system is expected to have one failure per month. What is the most effective way to meet the availability target?
Select an answer first
3expert · hard
A company is developing a new product and must decide how to allocate the reliability testing budget. The product has a high failure rate in early development, but the team expects it to improve over time. The company wants to track reliability growth. Which testing approach is most appropriate?
Select an answer first
4foundation · easy
Which of the following is an example of a reliability metric that would be specified in a reliability test specification?
Select an answer first
5foundation · easy
Which of the following is an example of a fault that would be introduced during fault tolerance testing?
Select an answer first

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