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 physically close together.. 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
Topology notes:
- 12 x Amazon EC2 c6i.large instances
- All instances run in us-east-1a
- Current network path between nodes averages 0.9 ms and occasionally spikes above 2 ms
- Workload logs: "gossip sync lag detected" and "broadcast step exceeded SLA"
- Requirement: minimize latency and jitter between nodes, not maximize fault isolation
Based on the exhibit, a distributed analytics workload runs on 12 EC2 instances in one Availability Zone. The nodes exchange thousands of small messages per second and require the lowest possible intra-cluster latency and jitter. Which EC2 placement strategy is the best fit?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Topology notes:
- 12 x Amazon EC2 c6i.large instances
- All instances run in us-east-1a
- Current network path between nodes averages 0.9 ms and occasionally spikes above 2 ms
- Workload logs: "gossip sync lag detected" and "broadcast step exceeded SLA"
- Requirement: minimize latency and jitter between nodes, not maximize fault isolation
A
Spread placement group, because it places each instance on distinct underlying hardware.
Why wrong: A spread placement group is optimized for availability by reducing correlated failure risk across individual instances. It intentionally separates instances across distinct hardware, which is useful for fault tolerance but not for minimizing east-west latency or jitter for a tightly coupled cluster.
B
Partition placement group, because it isolates nodes across rack partitions.
Why wrong: Partition placement groups help large distributed systems reduce the impact of correlated infrastructure failures by separating instances into logical partitions. They are a resilience feature, not a performance feature, and they do not provide the close network proximity needed for the lowest-latency message exchange.
C
Cluster placement group, because it places instances physically close together in one Availability Zone.
Cluster placement groups are designed for workloads that need very low network latency, low jitter, and high packet-per-second performance. Placing the instances physically close together within the same Availability Zone reduces network hop distance and is the best match for a message-heavy distributed analytics cluster.
D
Move the workload behind an Application Load Balancer so node-to-node traffic is balanced more efficiently.
Why wrong: An Application Load Balancer is for distributing client-to-service traffic at the application layer. It does not improve the network path between cluster nodes or reduce internal latency/jitter for east-west communication.
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, because it places instances physically close together in one Availability Zone.
A cluster placement group is the best choice because it places all 12 EC2 instances in a single Availability Zone within the same high-bandwidth, low-latency logical segment of the network. This minimizes the physical distance and network hops between nodes, achieving the lowest possible intra-cluster latency and jitter required for the thousands of small messages exchanged per second.
Key principle: Cluster placement groups place instances physically close together.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Spread placement group, because it places each instance on distinct underlying hardware.
Why it's wrong here
A spread placement group is optimized for availability by reducing correlated failure risk across individual instances. It intentionally separates instances across distinct hardware, which is useful for fault tolerance but not for minimizing east-west latency or jitter for a tightly coupled cluster.
✗
Partition placement group, because it isolates nodes across rack partitions.
Why it's wrong here
Partition placement groups help large distributed systems reduce the impact of correlated infrastructure failures by separating instances into logical partitions. They are a resilience feature, not a performance feature, and they do not provide the close network proximity needed for the lowest-latency message exchange.
✓
Cluster placement group, because it places instances physically close together in one Availability Zone.
Why this is correct
Cluster placement groups are designed for workloads that need very low network latency, low jitter, and high packet-per-second performance. Placing the instances physically close together within the same Availability Zone reduces network hop distance and is the best match for a message-heavy distributed analytics cluster.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Cluster placement groups place instances physically close together.
✗
Move the workload behind an Application Load Balancer so node-to-node traffic is balanced more efficiently.
Why it's wrong here
An Application Load Balancer is for distributing client-to-service traffic at the application layer. It does not improve the network path between cluster nodes or reduce internal latency/jitter for east-west communication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'spread' or 'partition' placement groups as providing better performance due to isolation, but they fail to recognize that cluster placement groups are the only strategy designed specifically for the lowest latency and jitter within a single AZ.
Detailed technical explanation
How to think about this question
Cluster placement groups use a low-latency, 10 Gbps or 25 Gbps network within a single AZ, leveraging the AWS Nitro System to achieve sub-millisecond latencies for inter-instance traffic. Under the hood, all instances in a cluster group are placed in the same 'cluster' of physical hardware, often within the same rack or adjacent racks, which reduces the number of network switches and cable lengths. In real-world scenarios, this is critical for tightly coupled HPC workloads like MPI jobs or real-time analytics using Apache Spark Streaming, where even microsecond-level jitter can degrade performance.
KKey Concepts to Remember
Cluster placement groups place instances physically close together.
They are optimized for low network latency and high throughput.
All instances in a Cluster placement group must be in the same Availability Zone.
They are suitable for tightly coupled distributed systems like HPC or big data.
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 physically close together.
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 physically close together., 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 physically close together..
What is the correct answer to this question?
The correct answer is: Cluster placement group, because it places instances physically close together in one Availability Zone. — A cluster placement group is the best choice because it places all 12 EC2 instances in a single Availability Zone within the same high-bandwidth, low-latency logical segment of the network. This minimizes the physical distance and network hops between nodes, achieving the lowest possible intra-cluster latency and jitter required for the thousands of small messages exchanged per second.
What should I do if I get this SAA-C03 question wrong?
Review cluster placement groups place instances physically close together., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Cluster placement groups place instances physically close together.
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