Question 1hardmulti select
Full question →hardmulti selectObjective-mapped
A marketing portal serves private PDF files stored in Amazon S3 through CloudFront. Users authenticate to the portal first, and each download link must expire after one hour. The S3 origin must never be directly reachable from the internet. Which three actions should be used? Select three.
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
Use CloudFront signed URLs or signed cookies with a one-hour expiration window.
CloudFront signed URLs or signed cookies enforce time-limited viewer authorization at the edge. For a one-hour access window, the distribution can issue a signature that CloudFront validates before it serves the object. Signed URLs are useful for a small number of object links, while signed cookies are better when the portal needs to grant access to multiple PDFs without generating a separate URL for each file.
B
Best answer
Configure an Origin Access Control for the S3 origin behind CloudFront.
Origin Access Control (OAC) lets CloudFront authenticate to S3 when retrieving objects, so the bucket does not need to be public. This is the standard way to keep the origin private while still allowing CloudFront to read the objects on behalf of viewers.
C
Best answer
Add an S3 bucket policy that allows only the CloudFront distribution, through its Origin Access Control, and denies public access.
The bucket policy should explicitly allow reads only from the CloudFront distribution and only when the request comes through the approved OAC path. Pairing that allow statement with Block Public Access and no public bucket ACLs prevents direct internet access to the origin and prevents bypassing CloudFront.
D
Distractor review
Expose the S3 bucket through the static website endpoint and secure it with security group rules.
S3 static website endpoints are public endpoints and do not support security groups. They cannot be used to keep content private behind CloudFront or to enforce origin-only access from the distribution.
E
Distractor review
Use an AWS WAF web ACL attached to the S3 bucket instead of CloudFront.
AWS WAF can protect supported front-door services such as CloudFront, but it cannot be attached to an S3 bucket. WAF also does not replace origin restriction; the S3 bucket still needs to be locked down so only CloudFront can fetch the objects.
Common exam trap
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Technical deep dive
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
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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?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: Use CloudFront signed URLs or signed cookies with a one-hour expiration window. — Private file delivery through CloudFront requires two controls at the viewer layer and one control at the origin layer. Signed URLs or signed cookies ensure only authenticated users receive temporary access and that the access expires after one hour. OAC keeps the S3 origin private by allowing CloudFront to retrieve objects without making the bucket public. A restrictive bucket policy then limits reads to the CloudFront distribution and blocks public access, preventing anyone from reaching the bucket directly over the internet. Why others are wrong: The S3 website endpoint is public by design and cannot be protected with security groups. AWS WAF is not attached to an S3 bucket; it belongs on CloudFront or another supported front-end service. The secure pattern is viewer authorization plus origin restriction, not exposing the bucket directly.
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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