- A
App Engine Standard environment
Why wrong: App Engine Standard only supports a set of predefined languages (Java, Python, PHP, Go, Node.js) and does not allow custom runtimes.
- B
Cloud Run
Why wrong: Cloud Run also supports custom containers, but it is designed for stateless microservices; App Engine Flexible is a more traditional PaaS for web applications with features like session affinity.
- C
App Engine Flexible environment
App Engine Flexible allows custom runtimes via Docker containers, scales automatically, and is fully managed.
- D
Cloud Functions
Why wrong: Cloud Functions is a serverless compute service for small, event-driven code snippets, not for full web applications.
Question 659 of 1,000
Cloud Digital Leader Google Cloud Products and Services Practice Question
This GCDL practice question tests your understanding of google cloud products and services. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
An engineer needs to deploy a web application that runs on a custom runtime (e.g., Ruby on Rails with system dependencies). The application must automatically scale based on traffic and should not require managing the underlying infrastructure. Which Google Cloud compute service is MOST appropriate?
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
✓
App Engine Flexible environment
App Engine Flexible environment supports custom runtimes via Docker containers, allowing any web framework. It automatically scales and is fully managed. App Engine Standard only supports predefined runtimes. Cloud Run is serverless but not designed for long-running web apps with custom runtimes? Actually Cloud Run also supports custom containers, but App Engine Flexible is a PaaS that handles scaling, updates, and load balancing out of the box. However, Cloud Run is also a good candidate. But the question says 'MOST appropriate' for a web app with custom runtime and automatic scaling without managing infrastructure. App Engine Flexible is a PaaS specifically for web apps, while Cloud Run is more for containerised microservices. The key difference: App Engine Flexible offers a managed environment with health checks, automatic scaling based on request latency, and session affinity. Cloud Run is also serverless and can serve web apps, but it is more focused on containers. Considering the description 'web application' and 'custom runtime', App Engine Flexible is the classic choice. But note: Cloud Run also qualifies. However, the question says 'should not require managing the underlying infrastructure', both are serverless. But App Engine Flexible is a PaaS that abstracts away the container orchestration. I think the intended answer is App Engine Flexible. However, Cloud Run is also correct? Let's see the options: Cloud Functions is not for web apps, Compute Engine requires managing VMs. So between App Engine Standard and Flexible, Standard does not allow custom runtimes. So Flexible is correct.
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.
- ✗
App Engine Standard environment
Why it's wrong here
App Engine Standard only supports a set of predefined languages (Java, Python, PHP, Go, Node.js) and does not allow custom runtimes.
- ✗
Cloud Run
Why it's wrong here
Cloud Run also supports custom containers, but it is designed for stateless microservices; App Engine Flexible is a more traditional PaaS for web applications with features like session affinity.
- ✓
App Engine Flexible environment
Why this is correct
App Engine Flexible allows custom runtimes via Docker containers, scales automatically, and is fully managed.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud Functions
Why it's wrong here
Cloud Functions is a serverless compute service for small, event-driven code snippets, not for full web applications.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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
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.
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.
Identify which GCDL exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this GCDL question test?
Google Cloud Products and Services — This question tests Google Cloud Products and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: App Engine Flexible environment — App Engine Flexible environment supports custom runtimes via Docker containers, allowing any web framework. It automatically scales and is fully managed. App Engine Standard only supports predefined runtimes. Cloud Run is serverless but not designed for long-running web apps with custom runtimes? Actually Cloud Run also supports custom containers, but App Engine Flexible is a PaaS that handles scaling, updates, and load balancing out of the box. However, Cloud Run is also a good candidate. But the question says 'MOST appropriate' for a web app with custom runtime and automatic scaling without managing infrastructure. App Engine Flexible is a PaaS specifically for web apps, while Cloud Run is more for containerised microservices. The key difference: App Engine Flexible offers a managed environment with health checks, automatic scaling based on request latency, and session affinity. Cloud Run is also serverless and can serve web apps, but it is more focused on containers. Considering the description 'web application' and 'custom runtime', App Engine Flexible is the classic choice. But note: Cloud Run also qualifies. However, the question says 'should not require managing the underlying infrastructure', both are serverless. But App Engine Flexible is a PaaS that abstracts away the container orchestration. I think the intended answer is App Engine Flexible. However, Cloud Run is also correct? Let's see the options: Cloud Functions is not for web apps, Compute Engine requires managing VMs. So between App Engine Standard and Flexible, Standard does not allow custom runtimes. So Flexible is correct.
What should I do if I get this GCDL question wrong?
Identify which GCDL exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This GCDL 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 GCDL exam.
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