Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A high-frequency trading analytics service runs on several EC2 instances in the same Availability Zone. The application exchanges small messages between nodes and is sensitive to microsecond-level network latency. Which design best meets the requirement?
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
Place the instances in a cluster placement group in one Availability Zone.
A cluster placement group places instances physically close together within one Availability Zone, which improves network throughput and reduces latency between nodes. That is the right fit for tightly coupled workloads that exchange frequent small messages and need the lowest possible east-west latency. It also keeps the design simple because the application already runs in a single AZ.
B
Distractor review
Place the instances in a spread placement group across multiple Availability Zones.
Spread placement groups are designed to reduce correlated failure risk by separating instances, not to minimize communication latency. Spreading instances across multiple AZs adds network distance and is the opposite of what a latency-sensitive clustered workload wants. The design improves resilience, but it sacrifices the fast intra-node communication the application needs.
C
Distractor review
Place the instances in a partition placement group within one Availability Zone.
Partition placement groups are useful when you want to isolate groups of instances from each other for resilience at large scale. They do not provide the same tight network proximity as a cluster placement group. For a low-latency analytics cluster, partitioning adds unnecessary separation and is not the best choice for fast node-to-node messaging.
D
Distractor review
Deploy the instances behind an Application Load Balancer in multiple Availability Zones.
An Application Load Balancer helps distribute client traffic for HTTP and HTTPS applications, but it does not optimize the private network path between EC2 instances. Adding multiple Availability Zones also increases the distance between nodes. That helps availability, but it does not address the workload's requirement for very low inter-instance latency.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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Question 2
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FAQ
Questions learners often ask
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: Place the instances in a cluster placement group in one Availability Zone. — A cluster placement group is the best architectural choice because it packs instances together inside one Availability Zone to maximize network performance. For workloads such as low-latency analytics, trading, or tightly coupled distributed systems, this placement strategy gives the lowest communication delay between nodes. Because the application already runs in a single AZ, the design aligns with the performance goal without adding unnecessary cross-AZ latency. Why others are wrong: Spread and partition placement groups are aimed at resilience and fault isolation, not the fastest possible network path. An Application Load Balancer is useful for request distribution, but it does not improve node-to-node communication inside a compute cluster. For this scenario, the key requirement is proximity between instances, which is why a cluster placement group is the correct answer.
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.
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