DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 working on a serverless application that uses Amazon DynamoDB as the database. The application reads and writes data to a DynamoDB table named 'Orders'. The table has a partition key 'OrderID' and a sort key 'OrderDate'. The application experiences high read latency during peak hours. The developer checks the CloudWatch metrics and notices high ReadThrottleEvents for the table. The table's read capacity is set to on-demand mode. The developer also notices that the application performs many queries that scan the entire table to find orders by customer ID, which is not a key attribute. What should the developer do to reduce read throttling?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Global Secondary Index (GSI) on the CustomerID attribute and query the index instead of scanning the table.
Option C is correct because creating a Global Secondary Index (GSI) on CustomerID allows efficient queries without scanning. Option A is wrong because increasing read capacity units doesn't apply to on-demand mode. Option B is wrong because on-demand mode already handles spikes, but throttling can still occur if a partition's throughput is exceeded. Option D is wrong because DAX is an in-memory cache that can reduce read load, but it doesn't fix the inefficient query pattern.
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.
✗
Enable DynamoDB Accelerator (DAX) to cache the read results.
Why it's wrong here
DAX can reduce read load, but it does not fix the scanning pattern; the queries would still scan the table if not using an index.
✗
Switch the table to provisioned capacity mode and increase the read capacity units.
Why it's wrong here
On-demand mode already scales automatically; the issue is inefficient queries.
✓
Create a Global Secondary Index (GSI) on the CustomerID attribute and query the index instead of scanning the table.
Why this is correct
A GSI allows efficient querying by CustomerID, avoiding full table scans.
Related concept
Static NAT maps one inside address to one outside address.
✗
Keep the table in on-demand mode but increase the maximum read capacity limit.
Why it's wrong here
On-demand mode has no maximum limit; throttling can still occur due to hot partitions.
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: Create a Global Secondary Index (GSI) on the CustomerID attribute and query the index instead of scanning the table. — Option C is correct because creating a Global Secondary Index (GSI) on CustomerID allows efficient queries without scanning. Option A is wrong because increasing read capacity units doesn't apply to on-demand mode. Option B is wrong because on-demand mode already handles spikes, but throttling can still occur if a partition's throughput is exceeded. Option D is wrong because DAX is an in-memory cache that can reduce read load, but it doesn't fix the inefficient query pattern.
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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