- A
Place the instances in a cluster placement group so AWS keeps them physically close together.
Cluster placement groups are intended for tightly coupled workloads that need low network latency and high throughput between instances. AWS places the instances on hardware that is physically close within the AZ, which improves east-west communication.
- B
Use instance types that support enhanced networking with the Elastic Network Adapter (ENA).
ENA-capable instance types provide higher packet-per-second performance, lower jitter, and better overall network efficiency than older virtual networking paths. For chatty distributed systems, that can materially improve latency and throughput.
- C
Spread the instances across multiple Availability Zones to reduce the chance of correlated failure.
Why wrong: Multi-AZ placement improves resilience, but it increases network distance and adds cross-AZ latency and data transfer cost. That is the opposite of the goal in a latency-sensitive compute cluster.
- D
Use a spread placement group so each instance lands on different underlying hardware.
Why wrong: Spread placement groups are designed for fault isolation, not for keeping instances close together. They can reduce blast radius, but they do not optimize for the lowest possible intra-cluster latency.
- E
Move the workload to burstable T-series instances to absorb short traffic spikes economically.
Why wrong: Burstable instances are cost-effective for variable CPU usage, but they do not specifically improve network latency or east-west messaging performance. The scenario is about inter-instance communication speed, not CPU burstability.
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 distributed analytics platform runs on 12 EC2 instances in one Availability Zone. The nodes exchange a very high volume of east-west messages and the team wants the lowest possible network latency between instances. Which two changes should the architect make first? Select two.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
Place the instances in a cluster placement group so AWS keeps them physically close together.
A cluster placement group is the correct choice because it ensures EC2 instances are placed in a single Availability Zone and are physically close together, which minimizes network latency and maximizes throughput for high-volume east-west traffic. This is the lowest-latency placement group option available, as it groups instances within a single rack or cluster of racks, reducing the number of network hops.
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.
- ✓
Place the instances in a cluster placement group so AWS keeps them physically close together.
Why this is correct
Cluster placement groups are intended for tightly coupled workloads that need low network latency and high throughput between instances. AWS places the instances on hardware that is physically close within the AZ, which improves east-west communication.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use instance types that support enhanced networking with the Elastic Network Adapter (ENA).
Why this is correct
ENA-capable instance types provide higher packet-per-second performance, lower jitter, and better overall network efficiency than older virtual networking paths. For chatty distributed systems, that can materially improve latency and throughput.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Spread the instances across multiple Availability Zones to reduce the chance of correlated failure.
Why it's wrong here
Multi-AZ placement improves resilience, but it increases network distance and adds cross-AZ latency and data transfer cost. That is the opposite of the goal in a latency-sensitive compute cluster.
- ✗
Use a spread placement group so each instance lands on different underlying hardware.
Why it's wrong here
Spread placement groups are designed for fault isolation, not for keeping instances close together. They can reduce blast radius, but they do not optimize for the lowest possible intra-cluster latency.
- ✗
Move the workload to burstable T-series instances to absorb short traffic spikes economically.
Why it's wrong here
Burstable instances are cost-effective for variable CPU usage, but they do not specifically improve network latency or east-west messaging performance. The scenario is about inter-instance communication speed, not CPU burstability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a spread placement group (which focuses on fault isolation) with a cluster placement group (which focuses on low latency), or they may think that spreading across Availability Zones improves performance when it actually increases latency.
Trap categories for this question
Scenario analysis trap
Burstable instances are cost-effective for variable CPU usage, but they do not specifically improve network latency or east-west messaging performance. The scenario is about inter-instance communication speed, not CPU burstability.
Detailed technical explanation
How to think about this question
Enhanced networking with ENA provides higher bandwidth, lower jitter, and lower per-packet processing overhead by offloading network I/O to the hardware. In a cluster placement group, instances can achieve up to 10 Gbps of single-flow network throughput and sub-millisecond latency, which is critical for distributed analytics platforms like Apache Spark or Kafka that rely on frequent east-west message exchange. The combination of a cluster placement group and ENA-enabled instances is a best practice for tightly coupled, latency-sensitive workloads.
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: Place the instances in a cluster placement group so AWS keeps them physically close together. — A cluster placement group is the correct choice because it ensures EC2 instances are placed in a single Availability Zone and are physically close together, which minimizes network latency and maximizes throughput for high-volume east-west traffic. This is the lowest-latency placement group option available, as it groups instances within a single rack or cluster of racks, reducing the number of network hops.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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