Google ACE Practice Question: Ensuring successful operation of a cloud solution
This ACE practice question tests your understanding of ensuring successful operation of 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.
Which THREE configurations are required to allow a Compute Engine instance in VPC A (without external IP) to send emails through a third-party SMTP server on the internet? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Cloud NAT gateway attached to VPC A.
Option A is correct because a Cloud NATgateway allows instances without external IP addresses to initiate outbound connections to the internet, translating their private IPs to a public IP for the SMTP server. Without Cloud NAT, the instance in VPC A cannot reach the third-party SMTP server on the internet because it lacks a public IP and the VPC has no outbound internet path.
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.
✓
A Cloud NAT gateway attached to VPC A.
Why this is correct
Enables outbound internet access for instances without external IP.
Related concept
Read the scenario before looking for a memorised answer.
✓
A route for the default internet gateway (0.0.0.0/0).
Why this is correct
Directs outbound traffic to the internet via the VPC's default route.
Related concept
Read the scenario before looking for a memorised answer.
✓
A firewall rule allowing egress traffic to the SMTP server's IP and port.
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that an instance without an external IP cannot reach the internet at all, but Cloud NAT provides outbound-only connectivity without a public IP on the instance, and candidates may incorrectly think ingress rules are needed for outbound traffic.
Detailed technical explanation
How to think about this question
Cloud NAT uses source network address translation (SNAT) to map private RFC 1918 addresses to a single public IP (or a pool) for outbound traffic, while preserving the ability to receive return traffic via connection tracking. The default route (0.0.0.0/0) to the internet gateway is necessary for the NAT gateway to forward packets to the internet, and the egress firewall rule must allow traffic to the SMTP server's IP and port (typically TCP 25, 587, or 465) to avoid being blocked by VPC firewall implicit deny rules.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Ensuring successful operation of a cloud solution — This question tests Ensuring successful operation of a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Cloud NAT gateway attached to VPC A. — Option A is correct because a Cloud NAT gateway allows instances without external IP addresses to initiate outbound connections to the internet, translating their private IPs to a public IP for the SMTP server. Without Cloud NAT, the instance in VPC A cannot reach the third-party SMTP server on the internet because it lacks a public IP and the VPC has no outbound internet path.
What should I do if I get this ACE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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