- A
Cluster placement group
Why wrong: Cluster placement groups place instances close together within a single Availability Zone, typically on the same rack (or tightly co-located hardware). This improves network latency but does not meet the requirement to avoid sharing the same underlying hardware rack.
- B
Spread placement group
Spread placement groups place instances across distinct underlying hardware, separating them onto different racks within a single Availability Zone. This reduces the chance that a rack-level issue impacts multiple instances simultaneously and directly matches the requirement.
- C
Partition placement group
Why wrong: Partition placement groups split instances into partitions to support large scale-out. They are useful for distributed systems, but they do not provide the same simple one-instance-per-rack separation guarantee as spread placement groups.
- D
No placement group, rely on the default scheduler
Why wrong: Without a placement group, you cannot control how instances are mapped to underlying hardware racks, so correlated rack-fault risk is not intentionally reduced.
Quick Answer
The answer is a Spread placement group. This strategy is the correct choice because it guarantees that each of your six EC2 instances is placed on a distinct underlying hardware rack, ensuring no two instances share the same rack-level fault domain. By isolating instances across separate racks, you directly eliminate the risk of correlated failures from a single rack outage, which is critical for a latency-sensitive trading workload that cannot tolerate simultaneous instance failures. On the SAA-C03 exam, this question tests your understanding of placement group strategies, often contrasting Spread groups with Cluster groups; a common trap is to choose a Cluster group for low latency, but that actually places instances on the same rack, increasing fault risk. Remember the memory tip: "Spread for separate racks, Cluster for close quarters."
SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A latency-sensitive trading workload runs on 6 EC2 instances. You must distribute the instances so they do NOT share the same underlying hardware rack, reducing the risk of correlated rack-level faults. Which EC2 placement group strategy best meets this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"NOT"Why it matters: Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Spread placement group
A Spread placement group is the correct choice because it ensures each EC2 instance is placed on distinct underlying hardware (different racks), eliminating shared fault domains. This directly meets the requirement to avoid correlated rack-level failures for latency-sensitive trading workloads.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cluster placement group
Why it's wrong here
Cluster placement groups place instances close together within a single Availability Zone, typically on the same rack (or tightly co-located hardware). This improves network latency but does not meet the requirement to avoid sharing the same underlying hardware rack.
- ✓
Spread placement group
Why this is correct
Spread placement groups place instances across distinct underlying hardware, separating them onto different racks within a single Availability Zone. This reduces the chance that a rack-level issue impacts multiple instances simultaneously and directly matches the requirement.
Clue confirmation
The clue words "NOT", "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Partition placement group
Why it's wrong here
Partition placement groups split instances into partitions to support large scale-out. They are useful for distributed systems, but they do not provide the same simple one-instance-per-rack separation guarantee as spread placement groups.
- ✗
No placement group, rely on the default scheduler
Why it's wrong here
Without a placement group, you cannot control how instances are mapped to underlying hardware racks, so correlated rack-fault risk is not intentionally reduced.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Partition placement groups with Spread groups, assuming partitions guarantee rack-level isolation, but partitions only separate instances into logical groups that may still share racks within a partition.
Detailed technical explanation
How to think about this question
Spread placement groups support a maximum of seven running instances per Availability Zone per group, enforcing strict hardware isolation across distinct racks. This is ideal for small, critical workloads like trading systems where fault domain separation is paramount, but it limits scalability compared to partition groups. Under the hood, AWS maps each instance to a unique rack ID, ensuring no two instances share the same network switch or power distribution unit.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design High-Performing Architectures — This question tests Design High-Performing Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Spread placement group — A Spread placement group is the correct choice because it ensures each EC2 instance is placed on distinct underlying hardware (different racks), eliminating shared fault domains. This directly meets the requirement to avoid correlated rack-level failures for latency-sensitive trading workloads.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "NOT", "best". Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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