SAA-C03 Design High-Performing Architectures Practice Question
A legacy application uses a monolithic architecture with a high-performance compute requirement. The application is CPU-bound and requires consistent sub-millisecond latency between compute nodes. Which EC2 feature should the architect use?
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
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Cluster Placement Groups.
Cluster Placement Groups provide high-density, low-latency, and high-throughput networking for compute-intensive applications. By placing instances in a single Availability Zone and a low-latency network cluster, the architect ensures that inter-node communication is as fast as possible. This is essential for HPC (High-Performance Computing) workloads where network jitter and latency can significantly degrade application performance. It allows the instances to participate in a low-latency, high-bandwidth network fabric within the AWS data center.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Spread Placement Groups.
Why it's wrong here
Spread Placement Groups are designed for high availability by placing instances on distinct physical hardware to minimize the impact of correlated failures. They do not provide the low-latency network performance required by CPU-bound, tightly coupled applications. Instead, they increase the physical distance between instances to improve fault tolerance.
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Cluster Placement Groups.
Why this is correct
Cluster Placement Groups are purpose-built for low-latency and high-throughput network performance. By packing instances into the same physical rack or cluster, they enable the high-speed interconnect required for CPU-bound, latency-sensitive applications. This is the optimal configuration for HPC workloads demanding consistent, ultra-fast inter-instance communication within a single AZ.
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Auto Scaling groups across multiple Availability Zones.
Why it's wrong here
Scaling across multiple Availability Zones increases fault tolerance, but it also introduces network latency between instances residing in different zones. For applications requiring sub-millisecond latency, spreading instances across multiple AZs is counterproductive. These applications generally require a single, high-performance network fabric provided by a Cluster Placement Group.
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Dedicated Hosts with physical CPU pinning.
Why it's wrong here
Dedicated Hosts allow for license compliance and physical hardware control, but they do not automatically provide a low-latency network fabric between multiple instances. While they offer performance isolation, the network communication between them still relies on the standard VPC network stack, unlike the optimized performance of Cluster Placement Groups.
About these practice questions
Courseiva writes every SAA-C03 question from scratch — 149 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.