The answer is that the limit 1 parameter combined with the default ordering returns the oldest log stream, not the latest. When you describe-log-streams with limit 1, AWS CloudWatch Logs returns only one stream based on the default sort order, which is ascending by last event time. Without explicitly specifying --order-by LastEventTime descending, the CLI fetches the stream with the smallest lastEventTimestamp, which in this case is from an hour ago, even though the Lambda function ran successfully five minutes ago. This question tests your understanding of how the describe-log-streams API paginates and orders results, a common trap on the DVA-C02 exam where developers assume limit 1 gives the most recent stream. The key insight is that limit restricts the count, but order determines which stream appears first. Memory tip: think of limit as a bouncer letting in only one person from the front of the line, but the line is sorted by oldest first unless you tell it to reverse.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Network Topology
A developer runs the AWS CLI command above to view the latest log stream for a Lambda function. The output shows a log stream with lastEventTimestamp of 1710493200000 (approximately 1 hour ago). However, the function was invoked 5 minutes ago and did not produce any errors. What is the MOST likely explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The command returned only the oldest log stream because of the limit and ordering parameters.
Option D is correct because the command only returns one log stream due to the limit 1 parameter. There may be newer log streams that are not shown. Option A is wrong because the function did not fail. Option B is wrong because the log stream exists. Option C is wrong because the function was invoked recently.
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 Lambda function was not actually invoked 5 minutes ago.
Why it's wrong here
The developer knows it was invoked.
✗
The Lambda function execution role lacks permissions to write to CloudWatch Logs.
Why it's wrong here
If permissions were missing, no logs would appear at all.
✗
The log stream was deleted after the last invocation.
Why it's wrong here
Log streams are not automatically deleted.
✓
The command returned only the oldest log stream because of the limit and ordering parameters.
Why this is correct
Descending order with limit 1 returns the most recent log stream, but the most recent may be older if there are multiple streams.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The command returned only the oldest log stream because of the limit and ordering parameters. — Option D is correct because the command only returns one log stream due to the limit 1 parameter. There may be newer log streams that are not shown. Option A is wrong because the function did not fail. Option B is wrong because the log stream exists. Option C is wrong because the function was invoked recently.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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