- A
Use a spread placement group to distribute instances across multiple underlying hardware to improve overall availability.
Why wrong: Spread placement groups are optimized for fault isolation across distinct underlying hardware. They intentionally reduce the likelihood of all instances sharing the same failure domain, which typically increases the variability in network paths rather than minimizing latency/jitter between instances.
- B
Use a cluster placement group so the instances are placed close together to reduce latency and jitter.
Cluster placement groups place instances close together (within a single Availability Zone when supported) to reduce network hop count and improve inter-instance network performance. This directly targets low-latency, jitter-sensitive communication between many nodes.
- C
Use no placement group and rely on the Auto Scaling group to balance instance placement automatically.
Why wrong: Auto Scaling helps with capacity and scaling, but it does not guarantee proximity of instances for low-latency inter-node traffic. Without a placement group, placement is determined by normal scheduling, which may not keep instances close together.
- D
Use a partition placement group so each instance is assigned to separate failure domains for low variance.
Why wrong: Partition placement groups are designed to distribute instances across partitions for capacity scaling with fault isolation (each partition is its own failure domain). They are not intended to keep instances in a tightly coupled network layout, so they do not best satisfy jitter-sensitive, low-latency requirements.
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 trading analytics system deploys 10 EC2 instances that exchange very frequent, low-latency messages over the network. The instances must be placed as close together as possible to minimize network hop count and inter-node jitter. Which deployment choice best matches this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Use a cluster placement group so the instances are placed close together to reduce latency and jitter.
A cluster placement group is designed for low-latency, high-throughput scenarios by placing all instances in a single Availability Zone within the same rack or logical cluster, minimizing network hop count and inter-node jitter. This directly meets the requirement for very frequent, low-latency messaging between 10 EC2 instances.
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.
- ✗
Use a spread placement group to distribute instances across multiple underlying hardware to improve overall availability.
Why it's wrong here
Spread placement groups are optimized for fault isolation across distinct underlying hardware. They intentionally reduce the likelihood of all instances sharing the same failure domain, which typically increases the variability in network paths rather than minimizing latency/jitter between instances.
- ✓
Use a cluster placement group so the instances are placed close together to reduce latency and jitter.
Why this is correct
Cluster placement groups place instances close together (within a single Availability Zone when supported) to reduce network hop count and improve inter-instance network performance. This directly targets low-latency, jitter-sensitive communication between many nodes.
Clue confirmation
The clue words "best", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use no placement group and rely on the Auto Scaling group to balance instance placement automatically.
Why it's wrong here
Auto Scaling helps with capacity and scaling, but it does not guarantee proximity of instances for low-latency inter-node traffic. Without a placement group, placement is determined by normal scheduling, which may not keep instances close together.
- ✗
Use a partition placement group so each instance is assigned to separate failure domains for low variance.
Why it's wrong here
Partition placement groups are designed to distribute instances across partitions for capacity scaling with fault isolation (each partition is its own failure domain). They are not intended to keep instances in a tightly coupled network layout, so they do not best satisfy jitter-sensitive, low-latency requirements.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'low latency' with 'high availability' and choose a spread placement group (Option A) thinking it reduces jitter, when in fact it increases network distance and latency by distributing instances across hardware.
Detailed technical explanation
How to think about this question
A cluster placement group uses a single 10 Gbps or 25 Gbps Ethernet switch and a single power distribution unit (PDU) to keep instances within a low-latency, non-blocking network fabric. This setup achieves sub-millisecond round-trip times (RTT) and up to 10 Gbps per-flow throughput, ideal for tightly coupled workloads like HPC or trading analytics. However, it also creates a single point of failure at the rack level, so it is not suitable for high-availability requirements.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Use a cluster placement group so the instances are placed close together to reduce latency and jitter. — A cluster placement group is designed for low-latency, high-throughput scenarios by placing all instances in a single Availability Zone within the same rack or logical cluster, minimizing network hop count and inter-node jitter. This directly meets the requirement for very frequent, low-latency messaging between 10 EC2 instances.
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: "best", "minimum / minimize". 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.
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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