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?

Use a spread placement group to distribute instances across multiple underlying hardware to improve overall availability.

Spread placement groups are optimized for fault isolation across distinct underlying hardware. They intentionally reduce the likelihood of all instances sharing the same failure domain, which typically increases the variability in network paths rather than minimizing latency/jitter between instances.

Use no placement group and rely on the Auto Scaling group to balance instance placement automatically.

Auto Scaling helps with capacity and scaling, but it does not guarantee proximity of instances for low-latency inter-node traffic. Without a placement group, placement is determined by normal scheduling, which may not keep instances close together.

Use a partition placement group so each instance is assigned to separate failure domains for low variance.

Partition placement groups are designed to distribute instances across partitions for capacity scaling with fault isolation (each partition is its own failure domain). They are not intended to keep instances in a tightly coupled network layout, so they do not best satisfy jitter-sensitive, low-latency requirements.

What does this SAA-C03 question test?

Static NAT maps one inside address to one outside address.

What is the correct answer to this question?

The correct answer is: Use a cluster placement group so the instances are placed close together to reduce latency and jitter. — A cluster placement group is designed to place instances close together within a single Availability Zone (when supported). Fewer network hops and tighter placement typically reduce both latency and inter-instance jitter—exactly what a trading analytics system needs for very frequent, low-latency message exchange. Spread placement groups focus on fault isolation, and partition placement groups focus on partitioning capacity for scaling; neither is the primary choice for minimizing inter-instance network variability. Spread placement groups intentionally spread instances across distinct underlying hardware to reduce correlated failures, which often increases network path variability. Partition placement groups split instances into separate partitions for scaling and fault isolation; they do not prioritize a single, tightly coupled network fabric. Omitting a placement group leaves placement to general AWS scheduling, which does not reliably minimize hop count or jitter for tightly synchronized workloads.

What should I do if I get this SAA-C03 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.