4.2 Design cost-optimized compute solutions.
Objective 4.2 sits in Design Cost-Optimized Architectures, which carries 20% of the Solutions Architect Associate exam. The questions below are original, written from the official objective title above, and each explanation cites the Amazon Web Services (AWS) page it rests on.
Objective title verbatim from the official objectives. Amazon Web Services (AWS) exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
A three year commitment covers a workload the team expects to move onto a different instance family within the first year. Which Reserved Instance choice survives that move?
Correct.
Concept
A long commitment and a changing workload pull against each other, and the pricing model answers that with a discount ladder. Giving up some of the discount buys the right to change the attributes the commitment was made against.
Why B
A Convertible Reserved Instance can be exchanged during its term for another Convertible with new attributes, including a different instance family. The discount is smaller than Standard, which is what pays for that flexibility.
Source
Now you: objective 4.2 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
A team commits to a three year Savings Plan, and six months later the workload doubles. They ask to raise the hourly commitment on the existing plan. What can they do?
Sample question 2 of 3
A product launch needs guaranteed capacity in one Availability Zone next quarter, and finance also wants a discount on the rate. What delivers both?
Sample question 3 of 3
A team sets a low maximum price on its Spot requests hoping to cap cost, and interruptions rise sharply afterwards. What does AWS say about that setting?
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Read the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.