DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 troubleshooting an AWS Lambda function that is timing out. The function is configured with a 3-second timeout. Which of the following could cause the function to timeout? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The function's reserved concurrency is set to 0.
Options A, B, and E are correct. Option A is correct because cold starts add latency. Option B is correct because a VPC with no NATgateway can cause network timeouts. Option C is wrong because a larger function size does not cause timeouts directly. Option D is wrong because DLQ is for async invocation failures, not timeouts. Option E is correct because hitting Lambda concurrency limits causes throttling, which can lead to timeout errors if the function waits.
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.
✓
The function's reserved concurrency is set to 0.
Why this is correct
Reserved concurrency of 0 prevents the function from scaling, causing throttling.
Related concept
Static NAT maps one inside address to one outside address.
✗
The function has a dead-letter queue configured.
Why it's wrong here
DLQ is for failed async invocations, not for timeouts.
✓
The function is configured to access a VPC without a NAT gateway.
Why this is correct
Without a NATgateway, the function cannot access the internet, causing external API calls to hang.
Related concept
Static NAT maps one inside address to one outside address.
✓
The function experiences a cold start.
Why this is correct
Cold starts add initialization time, which can cause timeouts if the function is short.
Related concept
Static NAT maps one inside address to one outside address.
✗
The function's deployment package is larger than 50 MB.
Why it's wrong here
Package size affects cold start but not within the same timeout if it's within limits.
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 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: The function's reserved concurrency is set to 0. — Options A, B, and E are correct. Option A is correct because cold starts add latency. Option B is correct because a VPC with no NAT gateway can cause network timeouts. Option C is wrong because a larger function size does not cause timeouts directly. Option D is wrong because DLQ is for async invocation failures, not timeouts. Option E is correct because hitting Lambda concurrency limits causes throttling, which can lead to timeout errors if the function waits.
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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