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Question 662 of 1,750

SDLC Automation →hardMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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 CodeDeploy to deploy a web application to an Auto Scaling group. The deployment fails during the 'ValidateService' lifecycle event. The CloudWatch Agent reports that the target process is running but the health check endpoint returns HTTP 503. The CodeDeploy agent logs show no errors. What is the most likely cause of the failure?

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.

A
The Auto Scaling group is not healthy
Why wrong: Auto Scaling health checks are not part of ValidateService.
B
The CodeDeploy agent is not installed on the instances
Why wrong: The agent logs were available, so it is installed.
C
The application is not fully functional due to missing configuration files
Process is running but health check fails, suggesting configuration issue.
D
The target process is not listening on the expected port
Why wrong: The process is running; it might be listening but returning 503.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The application is not fully functional due to missing configuration files

Option C is correct because the 'ValidateService' lifecycle event in CodeDeploy runs a health check against the application endpoint. A 503 HTTP status indicates the web server is running (the target process is up) but the application itself is not fully functional, often due to missing configuration files, environment variables, or dependencies. The CloudWatch Agent confirming the process is running and the CodeDeploy agent logs showing no errors further isolate the issue to the application layer, not the deployment infrastructure.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 Auto Scaling group is not healthy
Why it's wrong here
Auto Scaling health checks are not part of ValidateService.
✗
The CodeDeploy agent is not installed on the instances
Why it's wrong here
The agent logs were available, so it is installed.
✓
The application is not fully functional due to missing configuration files
Why this is correct
Process is running but health check fails, suggesting configuration issue.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The target process is not listening on the expected port
Why it's wrong here
The process is running; it might be listening but returning 503.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may assume a running process (confirmed by CloudWatch Agent) means the application is fully functional, but the 503 status explicitly indicates the application layer is failing, not the process or network layer.

Detailed technical explanation

How to think about this question

Under the hood, CodeDeploy's ValidateService hook executes a script (e.g., a curl command against localhost:port/health) defined in the AppSpec file's 'Hooks' section. An HTTP 503 status is defined by RFC 7231 as 'Service Unavailable,' meaning the server is temporarily unable to handle the request, often due to application-level initialization failures like missing database connections, configuration files, or environment variables. In real-world scenarios, this commonly occurs when a deployment copies new code but fails to update a required configuration file (e.g., database connection strings in a .env file or application.properties), causing the application to start but return errors on health checks.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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. 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

OSI Model Reference

Layer	Name	PDU	Key Protocols / Devices
7	Application	Data	HTTP, HTTPS, DNS, SMTP, FTP, SSH
6	Presentation	Data	TLS / SSL, JPEG, ASCII encoding
5	Session	Data	NetBIOS, RPC, SIP
4	Transport	Segment / Datagram	TCP, UDP
3	Network	Packet	IP, ICMP, OSPF — Routers
2	Data Link	Frame	Ethernet, Wi-Fi, PPP — Switches, Bridges
1	Physical	Bits	Cables, NICs, Hubs, Repeaters

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The application is not fully functional due to missing configuration files — Option C is correct because the 'ValidateService' lifecycle event in CodeDeploy runs a health check against the application endpoint. A 503 HTTP status indicates the web server is running (the target process is up) but the application itself is not fully functional, often due to missing configuration files, environment variables, or dependencies. The CloudWatch Agent confirming the process is running and the CodeDeploy agent logs showing no errors further isolate the issue to the application layer, not the deployment infrastructure.

What should I do if I get this DOP-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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