A hospital's patient monitoring system must be available 24/7, with no more than 5 minutes of unplanned downtime per month. The test team is planning availability testing. Which test scenario is most appropriate?

Monitor the system for a week and extrapolate the downtime to a month.

Monitor the system continuously for a month and record all unplanned downtime.

Monitor the system only during the busiest hour of the day.

Monitor the system after each planned maintenance window.

A web application is deployed on multiple servers behind a load balancer. The application must be available 99.9% of the time. During testing, the team finds that if one server fails, the load balancer redirects traffic to the remaining servers, but the application becomes slow and some requests time out. What is the most appropriate action?

Increase the availability target to 99% to account for the degraded performance.

Test the load balancer's ability to redirect traffic and consider the test successful.

Test the recovery of the failed server and consider the test successful.

Test the application's behavior under reduced capacity and verify that it still meets availability requirements.

What is the purpose of defining expected outcomes in a reliability test specification?

To document the system's design

To assign testers to specific tasks

To list the test environment requirements

To provide a basis for determining whether the test passed or failed

Which statistical measure is most directly used in maturity testing to quantify the average time between successive failures of a software system?

Mean time between failures (MTBF)

Which of the following is a key component of a reliability test plan?

Selection of appropriate test techniques

Certified Tester Advanced Level Technical Test Analyst

Domain 4Objective 2

Reliability Testing CTAL-TTA Practice Questions (Page 3)

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 11–15

11application · medium
A hospital's patient monitoring system must be available 24/7, with no more than 5 minutes of unplanned downtime per month. The test team is planning availability testing. Which test scenario is most appropriate?
Select an answer first
12expert · hard
A web application is deployed on multiple servers behind a load balancer. The application must be available 99.9% of the time. During testing, the team finds that if one server fails, the load balancer redirects traffic to the remaining servers, but the application becomes slow and some requests time out. What is the most appropriate action?
Select an answer first
13foundation · easy
What is the purpose of defining expected outcomes in a reliability test specification?
Select an answer first
14foundation · easy
Which statistical measure is most directly used in maturity testing to quantify the average time between successive failures of a software system?
Select an answer first
15foundation · easy
Which of the following is a key component of a reliability test plan?
Select an answer first

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