- A
Move all instances into a cluster placement group.
Cluster placement groups pack instances closely together in a single Availability Zone, which minimizes network distance and improves latency consistency. This is the best placement strategy when the workload is highly chatty and needs very low jitter between nodes. It directly targets east-west performance.
- B
Use instance families that provide high network bandwidth and support enhanced networking.
Instance selection matters because network bandwidth and packet processing capability affect latency under heavy inter-node messaging. Choosing network-optimized or otherwise high-bandwidth families with enhanced networking reduces contention and improves message throughput. This complements the placement group choice and improves the cluster’s overall behavior.
- C
Spread the instances across three Availability Zones for better fault tolerance.
Why wrong: Spreading across AZs improves resilience, but it increases network distance and typically adds latency. The scenario is explicitly about minimizing jitter and latency for frequent east-west traffic within one AZ, so multi-AZ spread is the wrong optimization.
- D
Front the nodes with an Application Load Balancer to balance the internal messages.
Why wrong: An ALB is for HTTP/HTTPS application traffic, not for direct node-to-node messaging performance. It adds a layer that does not solve the underlying east-west latency issue. The workload needs closer physical placement and better networking, not a web load balancer.
- E
Store the messages on EBS volumes so the nodes avoid network communication.
Why wrong: EBS is block storage for persistent data, not a low-latency message bus. Writing messages to disk would add storage latency and does not create efficient inter-node communication. It also changes the workload architecture in an unsupported way for this requirement.
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 engine runs 12 EC2 instances in one Availability Zone. The nodes exchange thousands of tiny messages per second and must keep jitter as low as possible. The current design launches the instances across multiple placement groups and uses general-purpose burstable instances. Which two changes will most directly lower east-west network latency and variability? Select two.
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
Move all instances into a cluster placement group.
A cluster placement group provides a low-latency, high-bandwidth network connection by placing instances in a single Availability Zone within the same logical rack or cluster. This minimizes the physical distance and network hops between instances, directly reducing east-west latency and jitter for the thousands of tiny messages per second.
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.
- ✓
Move all instances into a cluster placement group.
Why this is correct
Cluster placement groups pack instances closely together in a single Availability Zone, which minimizes network distance and improves latency consistency. This is the best placement strategy when the workload is highly chatty and needs very low jitter between nodes. It directly targets east-west performance.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use instance families that provide high network bandwidth and support enhanced networking.
Why this is correct
Instance selection matters because network bandwidth and packet processing capability affect latency under heavy inter-node messaging. Choosing network-optimized or otherwise high-bandwidth families with enhanced networking reduces contention and improves message throughput. This complements the placement group choice and improves the cluster’s overall behavior.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Spread the instances across three Availability Zones for better fault tolerance.
Why it's wrong here
Spreading across AZs improves resilience, but it increases network distance and typically adds latency. The scenario is explicitly about minimizing jitter and latency for frequent east-west traffic within one AZ, so multi-AZ spread is the wrong optimization.
- ✗
Front the nodes with an Application Load Balancer to balance the internal messages.
Why it's wrong here
An ALB is for HTTP/HTTPS application traffic, not for direct node-to-node messaging performance. It adds a layer that does not solve the underlying east-west latency issue. The workload needs closer physical placement and better networking, not a web load balancer.
- ✗
Store the messages on EBS volumes so the nodes avoid network communication.
Why it's wrong here
EBS is block storage for persistent data, not a low-latency message bus. Writing messages to disk would add storage latency and does not create efficient inter-node communication. It also changes the workload architecture in an unsupported way for this requirement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'fault tolerance' (spreading across AZs) with 'performance' (cluster placement group), or they mistakenly think a load balancer can optimize internal node-to-node traffic, when in fact it adds latency and is designed for client-facing traffic.
Trap categories for this question
Scenario analysis trap
Spreading across AZs improves resilience, but it increases network distance and typically adds latency. The scenario is explicitly about minimizing jitter and latency for frequent east-west traffic within one AZ, so multi-AZ spread is the wrong optimization.
Detailed technical explanation
How to think about this question
Cluster placement groups use a low-latency, 10 Gbps or 25 Gbps network path with non-blocking, full-bisection bandwidth, often leveraging ENA (Elastic Network Adapter) and SR-IOV for enhanced networking. The jitter reduction comes from the deterministic network topology and the elimination of shared-tenant contention within the same rack, which is critical for tightly coupled, latency-sensitive workloads like HPC or real-time analytics.
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
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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: Move all instances into a cluster placement group. — A cluster placement group provides a low-latency, high-bandwidth network connection by placing instances in a single Availability Zone within the same logical rack or cluster. This minimizes the physical distance and network hops between instances, directly reducing east-west latency and jitter for the thousands of tiny messages per second.
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.
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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