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Deploying and implementing a cloud solution →easyMultiple ChoiceObjective-mapped

Google ACE Deploying and implementing a cloud solution Practice Question

This ACE practice question tests your understanding of deploying and implementing a cloud solution. 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 retail company has a customer-facing web application that runs on a legacy architecture. The application consists of a PHP frontend and a MySQL database that must be co-located on the same virtual machine due to hardcoded configuration paths. The company is migrating to Google Cloud. They want to minimize operational overhead and ensure the application is resilient to a single zone failure. Additionally, they need to apply critical OS security patches monthly without causing downtime. The application's traffic is predictable, with peak load during business hours. The company has a small IT team with limited Kubernetes expertise. They are willing to use managed services but want to keep the application architecture as simple as possible. The existing application is not containerized and uses a specific Linux distribution. They have already tested the application on Compute Engine and confirmed it works on Debian 10. The database is approximately 50 GB and needs to be durable. They also need to ensure that the application can recover quickly if an instance fails. Which deployment strategy should they use? (Choose the best option.)

Clue words in this question

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

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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.

Question 1easymultiple choice

Read the full NAT/PAT explanation →

A
Deploy the application on a managed instance group with at least two instances, each in different zones, behind a TCP load balancer. Use a shared persistent disk for the database mounted on both instances and configure the application to use the same database path. Use rolling replacement for patching.
Why wrong: A shared persistent disk cannot be attached to multiple instances with read-write access; it would cause corruption.
B
Deploy the application in a GKE cluster with a single pod and a persistent volume claim for the database, using a LoadBalancer service. Use node auto-upgrades for patching.
Why wrong: Requires containerization and Kubernetes expertise; the company has limited Kubernetes knowledge.
C
Deploy the application on a managed instance group with at least two instances, each in different zones, behind a TCP load balancer. Use a regional persistent disk for the database and attach it to the primary instance; use a startup script to mount the disk and start the application. Use rolling updates for patching by updating the instance template and performing a rolling replacement.
Provides zonal resilience, regional disk for durability, and rolling updates for zero-downtime patching.
D
Deploy the application on a single Compute Engine instance in a single zone. Use snapshots for backup and a Cloud Load Balancer with a health check pointing to the instance.
Why wrong: Single zone does not provide zonal resilience; an outage takes down the app.

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

✓

Deploy the application on a managed instance group with at least two instances, each in different zones, behind a TCP load balancer. Use a regional persistent disk for the database and attach it to the primary instance; use a startup script to mount the disk and start the application. Use rolling updates for patching by updating the instance template and performing a rolling replacement.

Option C provides zonal resilience via a managed instance group across zones, uses a regional persistent disk for durability (can be attached to a new instance in case of failure), and rolling updates allow zero-downtime patching. Option A has no zonal resilience. Option B uses a shared persistent disk that cannot be attached read-write to multiple instances. Option D requires containerization and Kubernetes expertise, which the company lacks.

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.

✗
Deploy the application on a managed instance group with at least two instances, each in different zones, behind a TCP load balancer. Use a shared persistent disk for the database mounted on both instances and configure the application to use the same database path. Use rolling replacement for patching.
Why it's wrong here
A shared persistent disk cannot be attached to multiple instances with read-write access; it would cause corruption.
✗
Deploy the application in a GKE cluster with a single pod and a persistent volume claim for the database, using a LoadBalancer service. Use node auto-upgrades for patching.
Why it's wrong here
Requires containerization and Kubernetes expertise; the company has limited Kubernetes knowledge.
✓
Deploy the application on a managed instance group with at least two instances, each in different zones, behind a TCP load balancer. Use a regional persistent disk for the database and attach it to the primary instance; use a startup script to mount the disk and start the application. Use rolling updates for patching by updating the instance template and performing a rolling replacement.
Why this is correct
Provides zonal resilience, regional disk for durability, and rolling updates for zero-downtime patching.
Clue confirmation
The clue words "best", "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Deploy the application on a single Compute Engine instance in a single zone. Use snapshots for backup and a Cloud Load Balancer with a health check pointing to the instance.
Why it's wrong here
Single zone does not provide zonal resilience; an outage takes down the app.

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

An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.

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 ACE NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this ACE question test?

Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Deploy the application on a managed instance group with at least two instances, each in different zones, behind a TCP load balancer. Use a regional persistent disk for the database and attach it to the primary instance; use a startup script to mount the disk and start the application. Use rolling updates for patching by updating the instance template and performing a rolling replacement. — Option C provides zonal resilience via a managed instance group across zones, uses a regional persistent disk for durability (can be attached to a new instance in case of failure), and rolling updates allow zero-downtime patching. Option A has no zonal resilience. Option B uses a shared persistent disk that cannot be attached read-write to multiple instances. Option D requires containerization and Kubernetes expertise, which the company lacks.

What should I do if I get this ACE question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "best", "minimum / minimize". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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This ACE practice question is part of Courseiva's free Google Cloud 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 ACE exam.