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SAA-C03 Practice Question: Cluster placement groups provide the lowest…
This SAA-C03 practice question tests your understanding of cluster placement groups provide the lowest…. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: cluster placement groups provide the lowest latency and highest throughput — required for HPC and MPI. 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 company is deploying a high-performance computing (HPC) cluster with 16 EC2 instances. The workload requires the lowest possible network latency and highest throughput between all nodes for tightly coupled parallel MPI computations. Which EC2 placement group type should a solutions architect recommend?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Cluster placement group
Cluster PGs place instances physically close together in a single AZ for lowest latency and highest throughput. They support EFA for MPI-level performance — the standard HPC choice.
B
Distractor review
Partition placement group
Partition PGs distribute instances across separate hardware racks to reduce rack-failure impact. This increases inter-node distance and latency. Designed for distributed databases (Hadoop, Kafka), not tightly coupled HPC.
C
Distractor review
Spread placement group
Spread PGs place each instance on distinct hardware racks for maximum isolation. This increases inter-node distance — the opposite of what HPC requiring low latency needs.
D
Distractor review
No placement group — use Auto Scaling across multiple AZs
Cross-AZ Auto Scaling distributes instances for availability but increases inter-node latency. HPC requiring sub-microsecond inter-node communication needs all instances in one AZ within a Cluster PG.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Spread and Partition placement groups improve availability by distributing instances across racks or partitions — they intentionally increase inter-node distance, which increases latency. For HPC requiring sub-microsecond inter-node communication, low latency trumps availability. Cluster PG = maximum performance in one AZ. Spread PG = maximum isolation across racks.
Technical deep dive
How to think about this question
EC2 Placement Group types: - Cluster: Single AZ, same rack. Use for HPC, MPI, lowest latency, highest throughput. Supports EFA. - Partition: Multiple partitions, each isolated on separate racks. Use for HDFS, Cassandra, Kafka. Up to 7 partitions per AZ. - Spread: Each instance on distinct hardware rack. Use for small critical instances needing maximum HA. Up to 7 per AZ. Elastic Fabric Adapter (EFA) + Cluster PG: EFA provides OS-bypass networking for inter-node communication, achieving MPI-level performance. EFA is only beneficial within a Cluster placement group where physical proximity is guaranteed. Capacity risk: Cluster PGs require capacity on the same physical hardware. Launch all instances in one request to maximize the probability of successful placement.
KKey Concepts to Remember
- Cluster placement groups provide the lowest latency and highest throughput — required for HPC and MPI
- Cluster PGs confine all instances to a single Availability Zone
- Elastic Fabric Adapter (EFA) enables OS-bypass networking for MPI — requires Cluster PG
- Spread PGs maximize availability by placing each instance on distinct hardware racks
- Partition PGs are designed for large-scale distributed databases, not tightly coupled HPC
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 provide the lowest latency and highest throughput — required for HPC and MPI
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Cluster placement groups provide the lowest latency and highest throughput — required for HPC and MPI
What is the correct answer to this question?
The correct answer is: Cluster placement group — Cluster placement groups pack instances physically close together within a single Availability Zone, providing the lowest possible network latency and highest network throughput between instances. They support enhanced networking (SR-IOV) and Elastic Fabric Adapter (EFA) for inter-node MPI communication. Tightly coupled parallel HPC workloads require all nodes to communicate frequently with minimal latency. Cluster placement groups are specifically designed for this use case. The trade-off is all instances are in one AZ — if the AZ fails, the entire cluster is affected.
What should I do if I get this SAA-C03 question wrong?
Review cluster placement groups provide the lowest latency and highest throughput — required for HPC and MPI, then practise related SAA-C03 questions on the same topic to reinforce the concept.
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