The answer is to switch the table to DynamoDB on-demand capacity mode. This is correct because on-demand mode instantly accommodates traffic spikes by scaling write capacity automatically, eliminating throttling without requiring any manual capacity planning or adjustments. For the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of when to choose on-demand over provisioned capacity, especially for unpredictable workloads like marketing campaigns. A common trap is assuming that increasing the auto scaling maximum will solve the issue, but auto scaling reacts too slowly for sudden spikes, while on-demand handles them instantly. Another trap is suggesting DAX, which only accelerates reads, not writes. Remember the memory tip: "Spike? On-Demand's for you; Provisioned needs a queue."
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 financial services company has an Amazon DynamoDB table named 'Transactions' with provisioned read capacity of 10,000 RCU and write capacity of 5,000 WCU. The table stores transaction records for the past 90 days. The application performs point reads by transaction ID (partition key) and range queries by customer ID and timestamp (GSI). Recently, the company started a new marketing campaign, causing a sudden spike in write traffic. The write capacity is now at 4,500 WCU, and the application is experiencing occasional throttling on writes. The data engineer needs to ensure that writes are not throttled during future campaigns, while keeping costs low. The table currently has auto scaling enabled with a maximum capacity of 10,000 WCU. Which solution should the engineer implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Switch the table to DynamoDB on-demand capacity mode.
Option C is correct. DynamoDB on-demand mode automatically scales to accommodate traffic spikes, eliminating throttling without manual intervention. Option A is wrong because increasing max auto scaling setting still has a limit and may not react quickly enough. Option B is wrong because using SQS adds latency and complexity; not ideal for real-time. Option D is wrong because DAX is for reads, not writes.
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.
✓
Switch the table to DynamoDB on-demand capacity mode.
Why this is correct
On-demand mode scales instantly to handle any traffic spike, eliminating throttling.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use DynamoDB Accelerator (DAX) to cache write requests.
Why it's wrong here
DAX caches reads, not writes.
✗
Implement an Amazon SQS queue to buffer write requests and process them in batches.
Why it's wrong here
Adds latency and requires application changes; not suitable for real-time writes.
✗
Increase the maximum write capacity in the auto scaling configuration to 20,000 WCU.
Why it's wrong here
Auto scaling may not scale up fast enough for sudden spikes; also higher max increases cost.
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 DEA-C01 NAT questions on configuration and troubleshooting.
Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Switch the table to DynamoDB on-demand capacity mode. — Option C is correct. DynamoDB on-demand mode automatically scales to accommodate traffic spikes, eliminating throttling without manual intervention. Option A is wrong because increasing max auto scaling setting still has a limit and may not react quickly enough. Option B is wrong because using SQS adds latency and complexity; not ideal for real-time. Option D is wrong because DAX is for reads, not writes.
What should I do if I get this DEA-C01 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 DEA-C01 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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