- A
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-tags web-server
Why wrong: Using source-tags instead of target-tags would apply the rule to instances that have those source tags, not the desired target web-server instances.
- B
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-tags web-server --target-ranges 0.0.0.0/0
Why wrong: Source-tags and target-ranges are used incorrectly; this would allow traffic from instances tagged web-server to all destinations, which is egress.
- C
gcloud compute firewall-rules create allow-http --direction egress --allow tcp:80 --destination-ranges 0.0.0.0/0 --target-tags web-server
Why wrong: Egress direction controls outbound traffic, not inbound.
- D
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-ranges 0.0.0.0/0 --target-tags web-server
This creates an ingress rule allowing HTTP from anywhere to instances tagged 'web-server'.
Google ACE Configuring Access and Security Practice Question
This ACE practice question tests your understanding of configuring access and security. 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.
An engineer wants to allow HTTP traffic from the internet to a set of Compute Engine instances that have the network tag 'web-server'. Which firewall rule should they create?
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
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-ranges 0.0.0.0/0 --target-tags web-server
The correct command creates an ingress rule allowing TCP port 80 from any source (0.0.0.0/0) to instances with tag 'web-server'. Ingress rules are for incoming traffic. The other options have incorrect direction or target.
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.
- ✗
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-tags web-server
Why it's wrong here
Using source-tags instead of target-tags would apply the rule to instances that have those source tags, not the desired target web-server instances.
- ✗
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-tags web-server --target-ranges 0.0.0.0/0
Why it's wrong here
Source-tags and target-ranges are used incorrectly; this would allow traffic from instances tagged web-server to all destinations, which is egress.
- ✗
gcloud compute firewall-rules create allow-http --direction egress --allow tcp:80 --destination-ranges 0.0.0.0/0 --target-tags web-server
Why it's wrong here
Egress direction controls outbound traffic, not inbound.
- ✓
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-ranges 0.0.0.0/0 --target-tags web-server
Why this is correct
This creates an ingress rule allowing HTTP from anywhere to instances tagged 'web-server'.
Related concept
Read the scenario before looking for a memorised answer.
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.
What to study next
Got this wrong? Here's your next step.
Identify which ACE 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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Configuring Access and Security — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this ACE question test?
Configuring Access and Security — This question tests Configuring Access and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: gcloud compute firewall-rules create allow-http --allow tcp:80 --source-ranges 0.0.0.0/0 --target-tags web-server — The correct command creates an ingress rule allowing TCP port 80 from any source (0.0.0.0/0) to instances with tag 'web-server'. Ingress rules are for incoming traffic. The other options have incorrect direction or target.
What should I do if I get this ACE question wrong?
Identify which ACE 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 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.
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