- A
Cloud IDS
Why wrong: Cloud IDS detects threats but does not block traffic or rate limit.
- B
Cloud Armor
Cloud Armor provides IP blocking and rate limiting for HTTP(S) load balancers.
- C
VPC firewall rules
Why wrong: Firewall rules cannot provide rate limiting at the application layer.
- D
Network firewall policies
Why wrong: Network firewall policies are similar to VPC firewall rules and don't support rate limiting.
Question 766 of 985
PCSE Configuring Network Security Practice Question
This PCSE practice question tests your understanding of configuring network 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.
A security engineer needs to block traffic to a set of VMs from specific IP addresses and also apply rate limiting for HTTP traffic. The VMs are behind a global external HTTPS load balancer. Which service should they use?
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
✓
Cloud Armor
Cloud Armor security policies can be attached to load balancers to provide WAF capabilities, including IP allow/deny lists and rate limiting. This is the appropriate service for this scenario.
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.
- ✗
Cloud IDS
Why it's wrong here
Cloud IDS detects threats but does not block traffic or rate limit.
- ✓
Cloud Armor
Why this is correct
Cloud Armor provides IP blocking and rate limiting for HTTP(S) load balancers.
Related concept
Standard ACLs match source addresses.
- ✗
VPC firewall rules
Why it's wrong here
Firewall rules cannot provide rate limiting at the application layer.
- ✗
Network firewall policies
Why it's wrong here
Network firewall policies are similar to VPC firewall rules and don't support rate limiting.
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.
Trap categories for this question
Similar concept trap
Network firewall policies are similar to VPC firewall rules and don't support rate limiting.
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
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.
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 PCSE ACL questions on filtering logic and placement.
- →
Configuring Network Security — study guide chapter
Learn the concepts, then practise the questions
- →
Configuring Network Security practice questions
Targeted practice on this topic area only
- →
All PCSE questions
985 questions across all exam domains
- →
Google Professional Cloud Security Engineer study guide
Full concept coverage aligned to exam objectives
- →
PCSE practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related PCSE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Configuring Access Within a Cloud Solution Environment practice questions
Practise PCSE questions linked to Configuring Access Within a Cloud Solution Environment.
Ensuring Data Protection practice questions
Practise PCSE questions linked to Ensuring Data Protection.
Managing Operations in a Cloud Solution Environment practice questions
Practise PCSE questions linked to Managing Operations in a Cloud Solution Environment.
Configuring Network Security practice questions
Practise PCSE questions linked to Configuring Network Security.
Supporting Compliance Requirements practice questions
Practise PCSE questions linked to Supporting Compliance Requirements.
PCSE fundamentals practice questions
Practise PCSE questions linked to PCSE fundamentals.
PCSE scenario practice questions
Practise PCSE questions linked to PCSE scenario.
PCSE troubleshooting practice questions
Practise PCSE questions linked to PCSE troubleshooting.
Practice this exam
Start a free PCSE practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this PCSE question test?
Configuring Network Security — This question tests Configuring Network Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Cloud Armor — Cloud Armor security policies can be attached to load balancers to provide WAF capabilities, including IP allow/deny lists and rate limiting. This is the appropriate service for this scenario.
What should I do if I get this PCSE 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 PCSE ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PCSE 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 PCSE exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.