This DVA-C02 practice question tests your understanding of development with aws services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Refer to the exhibit. A developer runs the AWS CLI command to invoke a Lambda function. The command succeeds, but the function returns an error. The developer wants to see the error message and logs from the function execution. What should the developer add to the command?
--client-context string
Why wrong: This passes context data, does not return logs.
--qualifier alias
Why wrong: This specifies a version or alias, not logs.
--invocation-type Event
Why wrong: This makes the invocation async and does not return logs.
--log-type Tail
This returns the last 4 KB of log data.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
--log-type Tail
Option D is correct because the `--log-type Tail` parameter instructs the AWS CLI to retrieve the last 4 KB of log data from the function's execution and base64-encode it in the response. This allows the developer to see the error message and logs directly without needing to query CloudWatch Logs separately. The command must also use `--invocation-type RequestResponse` (the default) to get a synchronous response containing the logs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
--client-context string
Why it's wrong here
This passes context data, does not return logs.
--qualifier alias
Why it's wrong here
This specifies a version or alias, not logs.
--invocation-type Event
Why it's wrong here
This makes the invocation async and does not return logs.
--log-type Tail
Why this is correct
This returns the last 4 KB of log data.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse `--invocation-type Event` (async) with the ability to retrieve logs, not realizing that only synchronous invocations (`RequestResponse`) return execution results and logs via `--log-type Tail`.
Detailed technical explanation
When `--log-type Tail` is used with the `Invoke` API, the Lambda service captures the last 4 KB of logs from the execution environment and returns them base64-encoded in the `LogResult` field of the response. The developer must decode this base64 string (e.g., using `base64 -d` on Linux or `[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String()]` in PowerShell) to view the actual log output. This is particularly useful for debugging transient errors without enabling detailed CloudWatch Logs or waiting for log delivery.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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FAQ
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
The correct answer is: --log-type Tail — Option D is correct because the `--log-type Tail` parameter instructs the AWS CLI to retrieve the last 4 KB of log data from the function's execution and base64-encode it in the response. This allows the developer to see the error message and logs directly without needing to query CloudWatch Logs separately. The command must also use `--invocation-type RequestResponse` (the default) to get a synchronous response containing the logs.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. A developer ran the AWS CLI command to invoke a Lambda function. The response indicates an error. What should the developer do to see the error details?
mediumWhy A: Option A is correct because when you invoke a Lambda function synchronously using the AWS CLI with the `--log-type Tail` option, the response includes a `LogResult` field that contains the last 4 KB of the function's logs, base64-encoded. Decoding this base64 string reveals the actual log output, which includes error stack traces and other diagnostic information. This is the quickest way to see error details without navigating to the CloudWatch console.
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Last reviewed: Jul 4, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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