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. A key principle to apply: cluster placement groups place instances close together in a single AZ.. 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.
Exhibit
Network test results:
- Average node-to-node RTT: 180-240 microseconds
- Jitter spikes during busy periods: up to 4 ms
- Workload type: cluster-style analytics with frequent small messages
- Requirement: lowest possible latency among peers
- Deployment note: all 10 instances are currently in separate subnets within one AZ
Based on the exhibit, a low-latency analytics platform runs 10 EC2 instances in the same Availability Zone. The nodes exchange a very high volume of east-west messages and must experience the lowest possible network latency and jitter. A separate operations team also wants to reduce the risk that all nodes land on the same physical hardware rack. Which placement strategy should the solutions architect use?
Network test results:
- Average node-to-node RTT: 180-240 microseconds
- Jitter spikes during busy periods: up to 4 ms
- Workload type: cluster-style analytics with frequent small messages
- Requirement: lowest possible latency among peers
- Deployment note: all 10 instances are currently in separate subnets within one AZ
A
Cluster placement group
Cluster placement groups place instances physically close together to maximize bandwidth and minimize latency. That is the best fit for a high-chatty, east-west workload where network performance matters more than fault isolation at the rack level.
B
Spread placement group
Why wrong: Spread placement groups are meant to reduce correlated hardware failure risk, but they do not optimize for the lowest possible network latency between instances.
C
Partition placement group
Why wrong: Partition placement groups help isolate large distributed systems across hardware partitions, but they are not the best option when the primary goal is the tightest possible inter-node latency.
D
Auto Scaling group with a mixed instances policy
Why wrong: Auto Scaling can control instance count and diversity, but it does not by itself provide the specialized placement needed for ultra-low-latency east-west traffic.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cluster placement group
A cluster placement group is the correct choice because it provides the lowest possible network latency and jitter by ensuring all 10 EC2 instances are placed in close proximity within a single Availability Zone, enabling non-blocking, high-bandwidth communication. This is ideal for high-volume east-west traffic, as it maximizes network performance for tightly coupled workloads like analytics platforms.
Key principle: Cluster placement groups place instances close together in a single AZ.
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 this is correct
Cluster placement groups place instances physically close together to maximize bandwidth and minimize latency. That is the best fit for a high-chatty, east-west workload where network performance matters more than fault isolation at the rack level.
Related concept
Cluster placement groups place instances close together in a single AZ.
✗
Spread placement group
Why it's wrong here
Spread placement groups are meant to reduce correlated hardware failure risk, but they do not optimize for the lowest possible network latency between instances.
✗
Partition placement group
Why it's wrong here
Partition placement groups help isolate large distributed systems across hardware partitions, but they are not the best option when the primary goal is the tightest possible inter-node latency.
✗
Auto Scaling group with a mixed instances policy
Why it's wrong here
Auto Scaling can control instance count and diversity, but it does not by itself provide the specialized placement needed for ultra-low-latency east-west traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose a Spread placement group to reduce hardware rack risk, overlooking that the primary requirement is lowest latency and jitter, which cluster groups provide, while Spread groups sacrifice performance for fault isolation.
Detailed technical explanation
How to think about this question
Cluster placement groups use a low-latency, 10 Gbps or higher network with non-blocking, full-bisection bandwidth, leveraging Enhanced Networking (e.g., Elastic Network Adapter) and jumbo frames (MTU 9001) to minimize packet overhead and jitter. Under the hood, AWS places all instances in the same logical rack or within a single high-speed network segment, which can increase the risk of correlated failures if the rack fails, but this trade-off is acceptable for latency-sensitive workloads.
KKey Concepts to Remember
Cluster placement groups place instances close together in a single AZ.
They are designed for high-performance computing (HPC) and low-latency applications.
Cluster placement groups maximize network throughput and minimize latency between instances.
All instances in a Cluster placement group must be launched within the same Availability Zone.
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
Cluster placement groups place instances close together in a single AZ.
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.
Review cluster placement groups place instances close together in a single AZ., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design High-Performing Architectures — This question tests Design High-Performing Architectures — Cluster placement groups place instances close together in a single AZ..
What is the correct answer to this question?
The correct answer is: Cluster placement group — A cluster placement group is the correct choice because it provides the lowest possible network latency and jitter by ensuring all 10 EC2 instances are placed in close proximity within a single Availability Zone, enabling non-blocking, high-bandwidth communication. This is ideal for high-volume east-west traffic, as it maximizes network performance for tightly coupled workloads like analytics platforms.
What should I do if I get this SAA-C03 question wrong?
Review cluster placement groups place instances close together in a single AZ., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Cluster placement groups place instances close together in a single AZ.
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