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 a Lambda function that is failing with a 'Task timed out' error. The function is configured with a 3-second timeout. The function makes an HTTP request to an external API that sometimes takes more than 3 seconds to respond. Which THREE actions should the developer take to resolve this issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an asynchronous invocation pattern with a queue to decouple the HTTP request.
Options B, C, and E are correct. Increasing the Lambda timeout (B) allows the function to wait longer for the API response. Implementing a retry logic with exponential backoff (C) helps handle transient delays. Using an asynchronous invocation pattern (E) decouples the request from the response, allowing the function to return quickly and process the response later. Option A is incorrect because VPC configuration does not affect timeout. Option D is incorrect because reducing batch size is not relevant to timeout.
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 an asynchronous invocation pattern with a queue to decouple the HTTP request.
Why this is correct
Asynchronous processing prevents timeouts by returning immediately.
Related concept
Static NAT maps one inside address to one outside address.
✗
Place the Lambda function in a VPC to improve network latency.
Why it's wrong here
VPC placement does not reduce HTTP request time; it may add latency.
✓
Increase the Lambda function timeout to 10 seconds.
Why this is correct
A higher timeout accommodates slow responses.
Related concept
Static NAT maps one inside address to one outside address.
✗
Reduce the batch size in the event source mapping.
Why it's wrong here
Batch size is for SQS/S3 events, not for HTTP requests.
✓
Implement retry logic with exponential backoff in the function code.
Why this is correct
Retries can handle occasional slow responses.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Use an asynchronous invocation pattern with a queue to decouple the HTTP request. — Options B, C, and E are correct. Increasing the Lambda timeout (B) allows the function to wait longer for the API response. Implementing a retry logic with exponential backoff (C) helps handle transient delays. Using an asynchronous invocation pattern (E) decouples the request from the response, allowing the function to return quickly and process the response later. Option A is incorrect because VPC configuration does not affect timeout. Option D is incorrect because reducing batch size is not relevant to timeout.
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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