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Question 574 of 1,040

Design High-Performing Architectures →easyMultiple ChoiceObjective-mapped

Quick Answer

The answer is the EC2 cluster placement group, because it places instances into a low-latency, high-bandwidth group within a single Availability Zone, directly minimizing network latency and variability for east-west traffic. This strategy is specifically designed for applications that require very frequent, tightly coupled communication, such as a trading analytics system exchanging real-time messages between instances. On the SAA-C03 exam, this question tests your ability to distinguish between the three placement group strategies—cluster, spread, and partition—where the cluster is the only one optimized for low latency and high throughput, while spread and partition focus on fault isolation. A common trap is choosing a spread group for resilience, but the keyword “low latency” and “east-west” traffic should immediately point you to cluster. Memory tip: think “Cluster for Closeness” to remember it packs instances together for speed.

SAA-C03 Design High-Performing Architectures Practice Question

This SAA-C03 practice question tests your understanding of design high-performing architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 trading analytics system deploys multiple EC2 instances that exchange very frequent, low-latency, east-west messages. The application team wants the instances to be placed to minimize network latency and variability. Which AWS feature should they use?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

Question 1easymultiple choice

Full question →

A
EC2 Placement Groups with the "cluster" strategy
Cluster placement groups place instances close together within a single Availability Zone on underlying infrastructure intended to have low-latency, high-bandwidth networking between instances. This directly targets minimizing latency and jitter for inter-instance communication.
B
EC2 Placement Groups with the "spread" strategy
Why wrong: Spread placement groups are designed to reduce the risk of correlated failures by placing instances on distinct underlying hardware (for example, different racks). That separation can increase network latency compared to cluster placement groups, which are optimized for lowest latency.
C
Auto Scaling cooldown adjustments only
Why wrong: Cooldown controls how quickly Auto Scaling scales in or out after a scaling event. It does not influence where instances are physically placed on the underlying hardware, so it cannot reduce network latency variability between instances.
D
Switching the instances to a larger instance size without any placement group
Why wrong: Larger instance sizes can improve CPU or networking throughput, but without a placement group you do not get guidance to place the communicating instances close together. Latency variability between instances is therefore not addressed.

Full breakdown with real-world context →

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

✓

EC2 Placement Groups with the "cluster" strategy

The cluster placement group is the correct choice because it places instances into a low-latency, high-bandwidth group within a single Availability Zone, which minimizes network latency and variability for east-west traffic. This strategy is specifically designed for applications that require very frequent, low-latency communication between instances, such as trading analytics systems.

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.

✓
EC2 Placement Groups with the "cluster" strategy
Why this is correct
Cluster placement groups place instances close together within a single Availability Zone on underlying infrastructure intended to have low-latency, high-bandwidth networking between instances. This directly targets minimizing latency and jitter for inter-instance communication.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
EC2 Placement Groups with the "spread" strategy
Why it's wrong here
Spread placement groups are designed to reduce the risk of correlated failures by placing instances on distinct underlying hardware (for example, different racks). That separation can increase network latency compared to cluster placement groups, which are optimized for lowest latency.
✗
Auto Scaling cooldown adjustments only
Why it's wrong here
Cooldown controls how quickly Auto Scaling scales in or out after a scaling event. It does not influence where instances are physically placed on the underlying hardware, so it cannot reduce network latency variability between instances.
✗
Switching the instances to a larger instance size without any placement group
Why it's wrong here
Larger instance sizes can improve CPU or networking throughput, but without a placement group you do not get guidance to place the communicating instances close together. Latency variability between instances is therefore not addressed.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse the 'spread' placement group's high availability benefit with low-latency requirements, not realizing that spreading instances across racks increases network hops and latency.

Detailed technical explanation

How to think about this question

Cluster placement groups provide a non-blocking, fully bisectional bandwidth network topology by co-locating instances within a single 10 Gbps or 25 Gbps Ethernet segment, achieving sub-millisecond latency between members. Under the hood, AWS uses Enhanced Networking (SR-IOV) and Elastic Network Adapter (ENA) to bypass the hypervisor for data path, and the placement group ensures all instances are within the same rack or cluster of racks to minimize hop count. In real-world trading systems, this setup can reduce jitter to microseconds, which is critical for high-frequency trading algorithms that depend on consistent packet arrival times.

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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: EC2 Placement Groups with the "cluster" strategy — The cluster placement group is the correct choice because it places instances into a low-latency, high-bandwidth group within a single Availability Zone, which minimizes network latency and variability for east-west traffic. This strategy is specifically designed for applications that require very frequent, low-latency communication between instances, such as trading analytics systems.

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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Same concept, more angles

1 more ways this is tested on SAA-C03

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A trading analytics system deploys 10 EC2 instances that exchange very frequent, low-latency messages over the network. The instances must be placed as close together as possible to minimize network hop count and inter-node jitter. Which deployment choice best matches this requirement?

medium

A.Use a spread placement group to distribute instances across multiple underlying hardware to improve overall availability.
✓ B.Use a cluster placement group so the instances are placed close together to reduce latency and jitter.
C.Use no placement group and rely on the Auto Scaling group to balance instance placement automatically.
D.Use a partition placement group so each instance is assigned to separate failure domains for low variance.

Why B: A cluster placement group is designed for low-latency, high-throughput scenarios by placing all instances in a single Availability Zone within the same rack or logical cluster, minimizing network hop count and inter-node jitter. This directly meets the requirement for very frequent, low-latency messaging between 10 EC2 instances.

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