- A
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-tags web-server
Why wrong: Incorrect because --source-tags filters by source VM's tags, not source IP address. To allow from internet, --source-ranges 0.0.0.0/0 is needed.
- B
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-tags web-server --target-ranges 0.0.0.0/0
Why wrong: Incorrect because --source-tags is used incorrectly; also --target-ranges is not a valid flag for ingress rules; should be --target-tags.
- 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: Incorrect because --direction egress creates an outbound rule; inbound traffic requires ingress direction.
- D
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-ranges 0.0.0.0/0 --target-tags web-server
Correct. This command creates an ingress rule allowing tcp:80 from any source (0.0.0.0/0) to instances tagged 'web-server'.
Google ACE Firewall rule 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. A key principle to apply: firewall rule. 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 (option D) creates an ingress firewall rule allowing TCP port 80 from any source IP (0.0.0.0/0) to instances with target tag 'web-server'. Options A and B incorrectly use --source-tags (which filters by source tag, not source IP), so they would allow traffic only if the source has the tag, not from the internet. Option C specifies egress direction, which is for outbound traffic, not inbound.
Key principle: Firewall rule
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
Incorrect because --source-tags filters by source VM's tags, not source IP address. To allow from internet, --source-ranges 0.0.0.0/0 is needed.
- ✗
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
Incorrect because --source-tags is used incorrectly; also --target-ranges is not a valid flag for ingress rules; should be --target-tags.
- ✗
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
Incorrect because --direction egress creates an outbound rule; inbound traffic requires ingress direction.
- ✓
gcloud compute firewall-rules create allow-http --allow tcp:80 --source-ranges 0.0.0.0/0 --target-tags web-server
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
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Firewall rule
- Ingress vs Egress
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
Firewall rule
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review firewall rule, then practise related ACE questions on the same topic to reinforce the concept.
- →
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 — Firewall rule.
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 (option D) creates an ingress firewall rule allowing TCP port 80 from any source IP (0.0.0.0/0) to instances with target tag 'web-server'. Options A and B incorrectly use --source-tags (which filters by source tag, not source IP), so they would allow traffic only if the source has the tag, not from the internet. Option C specifies egress direction, which is for outbound traffic, not inbound.
What should I do if I get this ACE question wrong?
Review firewall rule, then practise related ACE questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Firewall rule
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Last reviewed: Jul 4, 2026
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