← SOA-C02·Amazon Web Services

Question 858 of 1,546

Reliability and Business Continuity →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to configure the ECS service to use a rolling update with a minimum healthy percent of 100 and a maximum percent of 200. This combination achieves zero-downtime deployment because it ensures new tasks are fully started and registered with the Application Load Balancer before any old tasks are stopped, maintaining full capacity throughout the update. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this concept tests your understanding of ECS deployment strategies and how to avoid the common trap of stopping old tasks first, which causes downtime. A frequent distractor is setting a maximum percent below 200, which limits the number of new tasks and can break the rolling update’s safety net. Remember the memory tip: “200 to grow, 100 to hold” — the maximum percent of 200 lets you spin up double the tasks, while the minimum healthy percent of 100 ensures no capacity drops below full strength.

SOA-C02 Reliability and Business Continuity Practice Question

This SOA-C02 practice question tests your understanding of reliability and business continuity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 has a production application running on Amazon ECS with Fargate launch type. The application uses an Application Load Balancer. The SysOps administrator notices that during deployments, the application experiences a brief period of downtime. Which combination of actions should the administrator take to achieve zero-downtime deployments?

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

A
Configure the ECS service to use a rolling update with a minimum healthy percent of 0 and a maximum percent of 100.
Why wrong: Incorrect: This would stop all old tasks before starting new ones, causing downtime.
B
Increase the deregistration delay on the ALB target group to 300 seconds.
Why wrong: Incorrect: While this helps drain connections, it does not prevent the underlying task replacement from causing downtime if not combined with proper rolling update settings.
C
Use a blue/green deployment with CodeDeploy and set the 'Minimum healthy percent' to 50.
Why wrong: Incorrect: Setting minimum healthy percent too low might cause capacity issues, and blue/green is good but not the only solution; this option does not guarantee zero downtime.
D
Configure the ECS service to use a rolling update with a minimum healthy percent of 100 and a maximum percent of 200.
Correct: This ensures new tasks are started before old ones are terminated, allowing zero downtime.

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

✓

Configure the ECS service to use a rolling update with a minimum healthy percent of 100 and a maximum percent of 200.

Option C is correct because configuring the ECS service to use rolling updates with a minimum healthy percent of 100 and a maximum percent of 200 ensures that new tasks are started before old ones are stopped, avoiding downtime. Option A is wrong because it limits the number of new tasks. Option B is wrong because it stops old tasks first. Option D is wrong because deregistration delay alone does not prevent downtime during deployment.

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.

✗
Configure the ECS service to use a rolling update with a minimum healthy percent of 0 and a maximum percent of 100.
Why it's wrong here
Incorrect: This would stop all old tasks before starting new ones, causing downtime.
✗
Increase the deregistration delay on the ALB target group to 300 seconds.
Why it's wrong here
Incorrect: While this helps drain connections, it does not prevent the underlying task replacement from causing downtime if not combined with proper rolling update settings.
✗
Use a blue/green deployment with CodeDeploy and set the 'Minimum healthy percent' to 50.
Why it's wrong here
Incorrect: Setting minimum healthy percent too low might cause capacity issues, and blue/green is good but not the only solution; this option does not guarantee zero downtime.
✓
Configure the ECS service to use a rolling update with a minimum healthy percent of 100 and a maximum percent of 200.
Why this is correct
Correct: This ensures new tasks are started before old ones are terminated, allowing zero downtime.
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 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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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 SOA-C02 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Reliability and Business Continuity — This question tests Reliability and Business Continuity — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Configure the ECS service to use a rolling update with a minimum healthy percent of 100 and a maximum percent of 200. — Option C is correct because configuring the ECS service to use rolling updates with a minimum healthy percent of 100 and a maximum percent of 200 ensures that new tasks are started before old ones are stopped, avoiding downtime. Option A is wrong because it limits the number of new tasks. Option B is wrong because it stops old tasks first. Option D is wrong because deregistration delay alone does not prevent downtime during deployment.

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

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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This SOA-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 SOA-C02 exam.