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SDLC Automation →mediumMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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.

A company uses AWS Elastic Beanstalk for deploying a web application. The development team wants to implement a blue/green deployment strategy to minimize downtime. Which approach should they use?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Update the Auto Scaling group launch configuration and gradually replace instances.
Why wrong: That is a rolling update, not blue/green.
B
Create a new CodeDeploy deployment group and use the blue/green deployment configuration.
Why wrong: CodeDeploy is not integrated with Elastic Beanstalk for blue/green.
C
Create a new Elastic Beanstalk environment and swap the environment CNAMEs.
Elastic Beanstalk provides environment swapping for blue/green.
D
Create a new target group and register instances from the old environment.
Why wrong: This does not leverage Elastic Beanstalk's blue/green feature.

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

✓

Create a new Elastic Beanstalk environment and swap the environment CNAMEs.

In AWS Elastic Beanstalk, blue/green deployment is achieved by creating a separate environment (the green environment) alongside the existing one (the blue environment), deploying the new application version to it, and then swapping the CNAME records of the two environments. This swap is instantaneous at the DNS level, resulting in zero downtime because traffic is immediately redirected from the old environment to the new one without any instance replacement or gradual shifting.

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.

✗
Update the Auto Scaling group launch configuration and gradually replace instances.
Why it's wrong here
That is a rolling update, not blue/green.
✗
Create a new CodeDeploy deployment group and use the blue/green deployment configuration.
Why it's wrong here
CodeDeploy is not integrated with Elastic Beanstalk for blue/green.
✓
Create a new Elastic Beanstalk environment and swap the environment CNAMEs.
Why this is correct
Elastic Beanstalk provides environment swapping for blue/green.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new target group and register instances from the old environment.
Why it's wrong here
This does not leverage Elastic Beanstalk's blue/green feature.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse the blue/green deployment mechanism in Elastic Beanstalk (CNAME swap) with the blue/green deployment in AWS CodeDeploy (which uses deployment groups and target groups), leading them to incorrectly select Option B.

Detailed technical explanation

How to think about this question

Under the hood, Elastic Beanstalk uses Route 53 CNAME records (or Alias records for custom domains) to map the environment URL to the load balancer DNS name. When you swap CNAMEs, Elastic Beanstalk atomically updates the DNS mapping so that the old environment's URL points to the new environment's load balancer, and vice versa. This operation is completed within seconds, and because both environments are fully running before the swap, there is no period where the application is unavailable. A subtle behavior is that database connections or session state must be managed externally (e.g., using ElastiCache or RDS) because the swap does not migrate any environment-specific data.

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

Common DNS Record Types

Record	Purpose	Example
A	IPv4 address mapping	example.com → 93.184.216.34
AAAA	IPv6 address mapping	example.com → 2606:2800::1
CNAME	Alias to another hostname	www → example.com
MX	Mail server for domain	example.com → mail.example.com (priority 10)
TXT	Text data (SPF, DKIM, verification)	v=spf1 include:_spf.example.com ~all
NS	Authoritative name servers	example.com NS ns1.example.com
PTR	Reverse DNS (IP → hostname)	34.216.184.93.in-addr.arpa → example.com
SOA	Zone authority record	Primary NS, admin email, serial, TTL defaults

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: Create a new Elastic Beanstalk environment and swap the environment CNAMEs. — In AWS Elastic Beanstalk, blue/green deployment is achieved by creating a separate environment (the green environment) alongside the existing one (the blue environment), deploying the new application version to it, and then swapping the CNAME records of the two environments. This swap is instantaneous at the DNS level, resulting in zero downtime because traffic is immediately redirected from the old environment to the new one without any instance replacement or gradual shifting.

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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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