← SOA-C02·Amazon Web Services

Question 411 of 1,546

Deployment, Provisioning, and Automation →hardMultiple SelectObjective-mapped

How to Prevent Accidental RDS Replacement in CloudFormation Updates

This SOA-C02 practice question tests your understanding of deployment, provisioning, and 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 CloudFormation to deploy a three-tier web application. The template includes an EC2 instance, an RDS database, and an Application Load Balancer. The SysOps administrator wants to ensure that the database is not replaced during an update if the administrator accidentally changes a property that requires replacement. Which THREE actions should the administrator take?

A
Use a custom resource backed by a Lambda function to manage the database.
Custom resources give you control over update behavior.
B
Set a DeletionPolicy attribute of 'Retain' on the RDS resource.
Retain prevents deletion of the database if the resource is removed from template.
C
Place the RDS instance in a separate nested stack.
Why wrong: Nested stacks do not inherently protect from replacement.
D
Enable termination protection on the CloudFormation stack.
Why wrong: Termination protection prevents stack deletion, not resource replacement.
E
Apply a stack policy that denies update to the RDS instance.
Stack policy can prevent modifications to the database resource.

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 custom resource backed by a Lambda function to manage the database.

The correct answers are A, B, and E. A is correct because a custom resource backed by Lambda can manage the database outside the CloudFormation lifecycle, preventing accidental replacement. B is correct because setting DeletionPolicy: Retain on the RDS resource ensures that if the resource is deleted during a stack update (e.g., due to a property change requiring replacement), the actual database is retained. E is correct because a stack policy can deny updates to the RDS instance, preventing modifications that would trigger replacement. C is incorrect: placing the RDS instance in a separate nested stack does not prevent replacement; it only isolates the resource, but replacement can still occur. D is incorrect: termination protection prevents stack deletion, not resource replacement within an update.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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 a custom resource backed by a Lambda function to manage the database.
Why this is correct
Custom resources give you control over update behavior.
Related concept
Standard ACLs match source addresses.
✓
Set a DeletionPolicy attribute of 'Retain' on the RDS resource.
Why this is correct
Retain prevents deletion of the database if the resource is removed from template.
Related concept
Standard ACLs match source addresses.
✗
Place the RDS instance in a separate nested stack.
Why it's wrong here
Nested stacks do not inherently protect from replacement.
✗
Enable termination protection on the CloudFormation stack.
Why it's wrong here
Termination protection prevents stack deletion, not resource replacement.
✓
Apply a stack policy that denies update to the RDS instance.
Why this is correct
Stack policy can prevent modifications to the database resource.
Related concept
Standard ACLs match source addresses.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

Quick reference

Cloud Service Model Comparison

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

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SOA-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Use a custom resource backed by a Lambda function to manage the database. — The correct answers are A, B, and E. A is correct because a custom resource backed by Lambda can manage the database outside the CloudFormation lifecycle, preventing accidental replacement. B is correct because setting DeletionPolicy: Retain on the RDS resource ensures that if the resource is deleted during a stack update (e.g., due to a property change requiring replacement), the actual database is retained. E is correct because a stack policy can deny updates to the RDS instance, preventing modifications that would trigger replacement. C is incorrect: placing the RDS instance in a separate nested stack does not prevent replacement; it only isolates the resource, but replacement can still occur. D is incorrect: termination protection prevents stack deletion, not resource replacement within an update.

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

What is the key concept behind this question?

Standard ACLs match source addresses.

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