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Question 541 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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is implementing a blue/green deployment strategy for a microservice hosted on AWS Elastic Beanstalk. They want to minimize downtime and be able to quickly roll back in case of issues. The deployment must support traffic shifting gradually. Which configuration 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
Use immutable updates with a fixed percentage of instances.
Why wrong: Immutable updates launch a full new set of instances, not gradual.
B
Use a blue/green deployment with a Classic Load Balancer and swap environment URLs.
Blue/green with URL swap allows gradual traffic shifting and quick rollback.
C
Use rolling updates with a batch size of 100%.
Why wrong: Rolling updates replace instances incrementally but are not blue/green.
D
Use canary deployments by configuring the Elastic Load Balancer listener rules.
Why wrong: Elastic Beanstalk does not natively support canary deployments.

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

✓

Use a blue/green deployment with a Classic Load Balancer and swap environment URLs.

Option B is correct because Elastic Beanstalk's blue/green deployment with a Classic Load Balancer and environment URL swap allows you to shift traffic gradually by pre-warming the new environment and then swapping the CNAME records. This minimizes downtime and provides a straightforward rollback by swapping back to the original environment URL. The URL swap is atomic and does not require DNS propagation delays, enabling rapid recovery.

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.

✗
Use immutable updates with a fixed percentage of instances.
Why it's wrong here
Immutable updates launch a full new set of instances, not gradual.
✓
Use a blue/green deployment with a Classic Load Balancer and swap environment URLs.
Why this is correct
Blue/green with URL swap allows gradual traffic shifting and quick rollback.
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.
✗
Use rolling updates with a batch size of 100%.
Why it's wrong here
Rolling updates replace instances incrementally but are not blue/green.
✗
Use canary deployments by configuring the Elastic Load Balancer listener rules.
Why it's wrong here
Elastic Beanstalk does not natively support canary deployments.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse 'blue/green deployment' with 'canary deployment' and assume Elastic Beanstalk supports canary via listener rules, but Elastic Beanstalk's built-in blue/green uses environment URL swap, not weighted traffic splitting.

Detailed technical explanation

How to think about this question

Under the hood, Elastic Beanstalk blue/green deployment creates a separate environment with its own CNAME, and the swap operation updates the Route 53 alias or ELB DNS record atomically. This avoids the need for DNS TTL-based traffic shifting, which can take minutes. In practice, you can also use an Application Load Balancer with weighted target groups for more granular traffic shifting, but that requires manual setup and is not a built-in Elastic Beanstalk deployment policy.

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: Use a blue/green deployment with a Classic Load Balancer and swap environment URLs. — Option B is correct because Elastic Beanstalk's blue/green deployment with a Classic Load Balancer and environment URL swap allows you to shift traffic gradually by pre-warming the new environment and then swapping the CNAME records. This minimizes downtime and provides a straightforward rollback by swapping back to the original environment URL. The URL swap is atomic and does not require DNS propagation delays, enabling rapid recovery.

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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