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mediummultiple choiceObjective-mapped

An application runs on EC2 in us-east-1 and frequently reads objects from an S3 bucket that is physically located in us-west-2. The finance team reports unexpectedly high inter-Region data transfer charges because the application retrieves objects for many user requests. A constraint: the bucket in us-west-2 must remain the system of record for compliance, but the application can read from a replica in us-east-1.

What should the solutions architect do to minimize network spend while meeting the compliance constraint?

Question 1mediummultiple choice
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An application runs on EC2 in us-east-1 and frequently reads objects from an S3 bucket that is physically located in us-west-2. The finance team reports unexpectedly high inter-Region data transfer charges because the application retrieves objects for many user requests. A constraint: the bucket in us-west-2 must remain the system of record for compliance, but the application can read from a replica in us-east-1.

What should the solutions architect do to minimize network spend while meeting the compliance constraint?

Full question →

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

Enable S3 Cross-Region Replication from the us-west-2 source bucket to a destination bucket in us-east-1, and update the app to read from the us-east-1 bucket.

CRR keeps the west bucket as the source of record while creating a near-region copy to reduce inter-Region transfer on reads.

B

Distractor review

Create an interface VPC endpoint for S3 in us-east-1 and keep all object reads pointing to the us-west-2 bucket.

VPC endpoints do not eliminate inter-Region transfer if the bucket remains in west; they only optimize private connectivity to the same Region.

C

Distractor review

Use VPC peering between two regions and route all requests to the us-west-2 bucket over the peering link.

VPC peering does not remove inter-Region S3 data transfer charges and adds network complexity.

D

Distractor review

Use Route 53 latency-based routing to send users to a us-west-2 web endpoint and keep the S3 bucket unchanged.

Routing user traffic to us-west-2 may help user latency, but it likely increases compute costs and still doesn’t address the read pattern cost driver.

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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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

A team needs to distribute TCP traffic (not HTTP) across multiple services. The services must see the original client source IP for auditing. Which AWS load balancer is the best fit?

Question 2

A team wants to run containerized services with AWS-managed orchestration and autoscaling. They do NOT require Kubernetes compatibility. Which AWS service choice is most appropriate to meet these goals?

Question 3

A solutions architect is designing an S3 bucket for a IoT ingestion API. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure? The design must avoid adding custom operational scripts.

Question 4

A solutions architect is designing an S3 bucket for a claims portal. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure?

Question 5

A team wants to delegate IAM management to developers, but must ensure developers can never grant themselves permissions beyond a specific limit. Which AWS mechanism best matches this requirement?

Question 6

A solutions architect is designing an S3 bucket for a healthcare document service. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure?

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: Enable S3 Cross-Region Replication from the us-west-2 source bucket to a destination bucket in us-east-1, and update the app to read from the us-east-1 bucket. — S3 Cross-Region Replication (CRR) is the best solution because it preserves us-west-2 as the system of record while creating a replicated destination bucket in us-east-1. Once replicas exist, the application can read from the local us-east-1 bucket, significantly reducing inter-Region data transfer charges driven by frequent object reads. VPC endpoints help with private connectivity but do not change the fact that reads are cross-Region when the bucket is in another Region. VPC peering and endpoint routing can reduce latency for network paths but do not eliminate the underlying inter-Region data transfer economics for S3. Why others are wrong: VPC endpoints don’t remove inter-Region S3 transfer when the requested bucket is still in us-west-2; traffic must cross Regions. VPC peering similarly does not change billing for cross-Region data transfer to S3 and adds operational overhead. Moving the entire web tier to us-west-2 could change the transfer profile, but it violates the intent to keep the application architecture in us-east-1 and often increases cost rather than minimizing it.

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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