- A
Use Amazon CloudWatch Events to create a custom rule that matches the source code path and triggers the pipeline.
Why wrong: This adds unnecessary complexity and cost; S3 event filtering is simpler and more direct.
- B
Enable versioning on the S3 bucket and configure the pipeline to use the latest version.
Why wrong: Versioning does not filter events by prefix; the pipeline would still trigger on any upload.
- C
Configure the S3 event notification to use a prefix filter that matches the source code directory.
S3 event notifications support prefix and suffix filtering, allowing precise triggers.
- D
Disable the S3 trigger and manually start the pipeline after each code commit.
Why wrong: Manual intervention defeats the purpose of automation and is inefficient.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 DevOps team uses AWS CodePipeline with an S3 source action and CodeBuild as a build provider. The pipeline has a manual approval step before deployment. Recently, the team noticed that the pipeline automatically starts when a new object is uploaded to the S3 bucket, even if the object is not the source code. They want to ensure that the pipeline only triggers on changes to the source code directory. What is the MOST efficient solution?
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
Configure the S3 event notification to use a prefix filter that matches the source code directory.
Option C is correct because S3 event notifications can be filtered by prefix and suffix, so setting a prefix filter to the source code directory ensures only changes to that directory trigger the pipeline. Option A is wrong because enabling versioning alone doesn't filter events. Option B is wrong because CloudWatch Events can filter but adds complexity and cost. Option D is wrong because disabling automatic triggers would require manual intervention, which is not efficient.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Amazon CloudWatch Events to create a custom rule that matches the source code path and triggers the pipeline.
Why it's wrong here
This adds unnecessary complexity and cost; S3 event filtering is simpler and more direct.
- ✗
Enable versioning on the S3 bucket and configure the pipeline to use the latest version.
Why it's wrong here
Versioning does not filter events by prefix; the pipeline would still trigger on any upload.
- ✓
Configure the S3 event notification to use a prefix filter that matches the source code directory.
Why this is correct
S3 event notifications support prefix and suffix filtering, allowing precise triggers.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Disable the S3 trigger and manually start the pipeline after each code commit.
Why it's wrong here
Manual intervention defeats the purpose of automation and is inefficient.
Common exam traps
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.
Detailed technical explanation
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.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure the S3 event notification to use a prefix filter that matches the source code directory. — Option C is correct because S3 event notifications can be filtered by prefix and suffix, so setting a prefix filter to the source code directory ensures only changes to that directory trigger the pipeline. Option A is wrong because enabling versioning alone doesn't filter events. Option B is wrong because CloudWatch Events can filter but adds complexity and cost. Option D is wrong because disabling automatic triggers would require manual intervention, which is not efficient.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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