- A
Traffic is denied only if the source is exactly 10.0.0.1; otherwise allowed.
Why wrong: Incorrect: The deny rule applies to the entire /24 range.
- B
Traffic is denied because the deny rule has a higher priority (lower number).
Correct: The deny rule (priority 500) takes precedence over the allow rule (priority 1000).
- C
Traffic is allowed because the allow rule covers a larger range.
Why wrong: Incorrect: Priority overrides; the deny rule has higher priority.
- D
Traffic is allowed because both rules match and the default is to allow.
Why wrong: Incorrect: When both allow and deny rules match, the one with higher priority wins.
Question 863 of 1,000
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 creates a firewall rule allowing ingress on port 8080 from source range 10.0.0.0/8 with priority 1000. Another rule denies ingress on port 8080 from source range 10.0.0.0/24 with priority 500. What is the effective behavior for traffic from 10.0.0.1?
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
✓
Traffic is denied because the deny rule has a higher priority (lower number).
Firewall rules are evaluated in order of priority; lower numbers have higher priority. The deny rule (priority 500) has higher priority than the allow rule (priority 1000), so traffic from 10.0.0.1 (within 10.0.0.0/24) will be denied.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Traffic is denied only if the source is exactly 10.0.0.1; otherwise allowed.
Why it's wrong here
Incorrect: The deny rule applies to the entire /24 range.
- ✓
Traffic is denied because the deny rule has a higher priority (lower number).
Why this is correct
Correct: The deny rule (priority 500) takes precedence over the allow rule (priority 1000).
Related concept
Standard ACLs match source addresses.
- ✗
Traffic is allowed because the allow rule covers a larger range.
Why it's wrong here
Incorrect: Priority overrides; the deny rule has higher priority.
- ✗
Traffic is allowed because both rules match and the default is to allow.
Why it's wrong here
Incorrect: When both allow and deny rules match, the one with higher priority wins.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ACE ACL questions on filtering logic and placement.
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Configuring Access and Security — study guide chapter
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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 — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Traffic is denied because the deny rule has a higher priority (lower number). — Firewall rules are evaluated in order of priority; lower numbers have higher priority. The deny rule (priority 500) has higher priority than the allow rule (priority 1000), so traffic from 10.0.0.1 (within 10.0.0.0/24) will be denied.
What should I do if I get this ACE question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ACE ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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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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