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Question 528 of 1,000

Implementing VPC Instances →mediumMultiple ChoiceObjective-mapped

PCNE Implementing VPC Instances Practice Question

This PCNE practice question tests your understanding of implementing vpc instances. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company wants to apply consistent firewall rules across all projects in an organization. They need to block all traffic to ports 22 and 3389 from the internet to any VMs in any project. Which approach is most scalable and maintainable?

A
Use a hierarchical firewall policy at the organization level with deny rules for ports 22 and 3389 from 0.0.0.0/0.
Hierarchical policies apply to all projects under the org, ensuring consistency.
B
Configure OS-level firewall on each VM using startup scripts.
Why wrong: This is not centralized and difficult to maintain.
C
Use Cloud Armor security policies attached to load balancers.
Why wrong: Cloud Armor protects load-balanced traffic, not all VMs directly.
D
Create a VPC firewall rule in each project's VPC.
Why wrong: This is not scalable; managing rules across many projects is error-prone.

Full breakdown with real-world context →

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

✓

Use a hierarchical firewall policy at the organization level with deny rules for ports 22 and 3389 from 0.0.0.0/0.

Hierarchical firewall policies allow you to define firewall rules at the organization or folder level that apply to all VPCs under that node. This ensures consistency and avoids duplication across projects. The policy is evaluated before VPC firewall rules.

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.

✓
Use a hierarchical firewall policy at the organization level with deny rules for ports 22 and 3389 from 0.0.0.0/0.
Why this is correct
Hierarchical policies apply to all projects under the org, ensuring consistency.
Related concept
Standard ACLs match source addresses.
✗
Configure OS-level firewall on each VM using startup scripts.
Why it's wrong here
This is not centralized and difficult to maintain.
✗
Use Cloud Armor security policies attached to load balancers.
Why it's wrong here
Cloud Armor protects load-balanced traffic, not all VMs directly.
✗
Create a VPC firewall rule in each project's VPC.
Why it's wrong here
This is not scalable; managing rules across many projects is error-prone.

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

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 PCNE ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this PCNE question test?

Implementing VPC Instances — This question tests Implementing VPC Instances — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Use a hierarchical firewall policy at the organization level with deny rules for ports 22 and 3389 from 0.0.0.0/0. — Hierarchical firewall policies allow you to define firewall rules at the organization or folder level that apply to all VPCs under that node. This ensures consistency and avoids duplication across projects. The policy is evaluated before VPC firewall rules.

What should I do if I get this PCNE question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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