The correct combination of metrics to analyze is DynamoDB throttled write events and Lambda concurrent executions. This pairing directly reveals the root cause because when Lambda functions experience throttling and timeouts with DynamoDB, it is typically due to the function’s concurrent executions exceeding the DynamoDB table’s provisioned write capacity, causing write requests to be throttled. Monitoring DynamoDB throttled write events shows exactly when the database is rejecting writes, while Lambda concurrent executions reveals whether the function is scaling beyond expected limits. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your ability to correlate application-layer scaling with database capacity constraints, a common real-world bottleneck. A frequent trap is choosing Lambda invocations or duration, which measure throughput and performance but not throttling, or DynamoDB errors, which are too broad. Remember the memory tip: “Concurrency causes throttling” — if you see timeouts, always check concurrent executions against DynamoDB write capacity.
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. 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 company uses AWS Lambda with an Amazon DynamoDB table to process high-volume clickstream data. The Lambda function writes the data to DynamoDB. Recently, the function has been experiencing throttling and timeouts during peak traffic. The DevOps team needs to set up monitoring to identify the root cause. Which combination of metrics should they analyze?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DynamoDB throttled write events and Lambda concurrent executions.
Option C is correct because DynamoDB throttling metrics and Lambda concurrency metrics directly indicate the issue. Option A is wrong because Lambda invocations and duration don't show throttling. Option B is wrong because DynamoDB read/write capacity and Lambda errors don't pinpoint the cause. Option D is wrong because CloudWatch Logs and Lambda memory are not the primary indicators.
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.
✓
DynamoDB throttled write events and Lambda concurrent executions.
Why this is correct
Throttled write events indicate DynamoDB throttling, and concurrent executions show if Lambda is under-provisioned.
Related concept
Static NAT maps one inside address to one outside address.
✗
DynamoDB read and write capacity metrics and Lambda error count.
Why it's wrong here
Error count does not identify throttling source.
✗
CloudWatch metrics for Lambda invocations and duration.
Why it's wrong here
These metrics show overall performance but not throttling cause.
✗
CloudWatch Logs for Lambda function logs and Lambda memory utilization.
Why it's wrong here
Memory utilization may cause timeouts but not throttling.
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.
Trap categories for this question
Command / output trap
These metrics show overall performance but not throttling cause.
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 DOP-C02 NAT questions on configuration and troubleshooting.
Monitoring and Logging — This question tests Monitoring and Logging — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: DynamoDB throttled write events and Lambda concurrent executions. — Option C is correct because DynamoDB throttling metrics and Lambda concurrency metrics directly indicate the issue. Option A is wrong because Lambda invocations and duration don't show throttling. Option B is wrong because DynamoDB read/write capacity and Lambda errors don't pinpoint the cause. Option D is wrong because CloudWatch Logs and Lambda memory are not the primary indicators.
What should I do if I get this DOP-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 DOP-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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