DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is designing a system where an S3 bucket receives uploads, and each upload triggers a Lambda function to process the file. The processed output is stored in another S3 bucket. The developer notices that sometimes the same file is processed multiple times. How can this be prevented?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Make the Lambda function idempotent by checking if the object has already been processed using a DynamoDB table.
Option C is correct because enabling S3 event notifications with the 'S3:ObjectCreated:*' event type and ensuring the Lambda function is idempotent (e.g., using the object key as a unique identifier) prevents duplicate processing. Option A is wrong because S3 does not have a deduplication feature for events. Option B is wrong because SQS FIFO queues can deduplicate messages, but S3 event notifications do not support FIFO queues. Option D is wrong because versioning does not prevent duplicate events.
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.
✓
Make the Lambda function idempotent by checking if the object has already been processed using a DynamoDB table.
Why this is correct
Idempotency ensures that duplicate events do not cause duplicate processing.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use an SQS FIFO queue as the event destination and enable content-based deduplication.
Why it's wrong here
S3 cannot send events to FIFO queues.
✗
Enable S3 bucket replication to another bucket and trigger Lambda from the replica.
Why it's wrong here
Replication does not prevent duplicate events.
✗
Enable S3 bucket versioning and use 's3:ObjectCreated:Put' events.
Why it's wrong here
Versioning does not eliminate duplicate events.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 DVA-C02 NAT questions on configuration and troubleshooting.
Development with AWS Services — This question tests Development with AWS Services — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Make the Lambda function idempotent by checking if the object has already been processed using a DynamoDB table. — Option C is correct because enabling S3 event notifications with the 'S3:ObjectCreated:*' event type and ensuring the Lambda function is idempotent (e.g., using the object key as a unique identifier) prevents duplicate processing. Option A is wrong because S3 does not have a deduplication feature for events. Option B is wrong because SQS FIFO queues can deduplicate messages, but S3 event notifications do not support FIFO queues. Option D is wrong because versioning does not prevent duplicate events.
What should I do if I get this DVA-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 DVA-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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Question Discussion
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