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 company is building a serverless application using AWS Lambda. The application processes messages from an Amazon SQS queue. The Lambda function is idempotent and handles duplicate messages correctly. The company needs to ensure that messages are processed in the order they were sent. Which solution should the company use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the Lambda function to poll an SQS FIFO queue with a batch size of 1.
Option A is correct because using an SQS FIFO queue ensures exactly-once processing and preserves message order. Lambda can poll FIFO queues with a batch size of 1 to maintain order. Option B is wrong because standard queues do not guarantee order. Option C is wrong because Kinesis Data Streams does not integrate natively with Lambda's event source mapping for ordered processing of individual messages. Option D is wrong because SNS does not provide ordering guarantees.
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 SNS to fan out messages to Lambda.
Why it's wrong here
SNS does not provide ordering.
✗
Use Amazon Kinesis Data Streams as the event source for Lambda.
Why it's wrong here
Kinesis does not guarantee per-message ordering across shards.
✗
Configure the Lambda function to poll an SQS standard queue with a batch size of 10.
Why it's wrong here
Standard queues do not guarantee order.
✓
Configure the Lambda function to poll an SQS FIFO queue with a batch size of 1.
Why this is correct
Using an SQS FIFO queue with batch size 1 ensures messages are processed in order and exactly once.
Related concept
Static NAT maps one inside address to one outside address.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Configure the Lambda function to poll an SQS FIFO queue with a batch size of 1. — Option A is correct because using an SQS FIFO queue ensures exactly-once processing and preserves message order. Lambda can poll FIFO queues with a batch size of 1 to maintain order. Option B is wrong because standard queues do not guarantee order. Option C is wrong because Kinesis Data Streams does not integrate natively with Lambda's event source mapping for ordered processing of individual messages. Option D is wrong because SNS does not provide ordering guarantees.
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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