Google PCA Manage implementation of cloud architecture Practice Question
This PCA practice question tests your understanding of manage implementation of cloud architecture. 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.
Which TWO statements about Google Cloud VPC firewall rules are correct? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Firewall rules allow you to specify both source and destination IP ranges.
Option B is correct because Google Cloud VPC firewall rules are stateful and allow you to specify both source and destination IP ranges in a single rule. This enables granular control over traffic direction, such as allowing ingress from a specific source CIDR to a specific destination CIDR within the VPC.
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.
✗
Firewall rules are stateless and require explicit rules for return traffic.
Why it's wrong here
Rules are stateful.
✓
Firewall rules allow you to specify both source and destination IP ranges.
Why this is correct
Rules can have source and destination filters.
Related concept
Read the scenario before looking for a memorised answer.
✗
Default VPC has firewall rules that block all ingress traffic.
Why it's wrong here
Default VPC allows ICMP, RDP, SSH ingress from anywhere.
✗
Firewall rules cannot be applied to instances by service account.
Why it's wrong here
They can use target service accounts.
✓
Hierarchical firewall policies can be applied to the organization, folder, or project level.
Why this is correct
Yes, they are evaluated before VPC firewall rules.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that firewall rules are stateless or that the default VPC blocks all ingress, when in fact Google Cloud VPC rules are stateful and the default VPC allows specific ingress traffic (ICMP, RDP, SSH) from any source.
Detailed technical explanation
How to think about this question
Under the hood, Google Cloud VPC firewall rules are implemented as distributed firewall rules enforced at the hypervisor level, not on the instance itself. They support both IPv4 and IPv6 CIDR ranges, and when using service accounts, the firewall evaluates the service account attached to the instance's network interface. A real-world scenario is using hierarchical firewall policies to enforce organization-wide security baselines, such as blocking all SSH access except from a specific admin CIDR, which overrides project-level rules.
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.
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
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Manage implementation of cloud architecture — This question tests Manage implementation of cloud architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Firewall rules allow you to specify both source and destination IP ranges. — Option B is correct because Google Cloud VPC firewall rules are stateful and allow you to specify both source and destination IP ranges in a single rule. This enables granular control over traffic direction, such as allowing ingress from a specific source CIDR to a specific destination CIDR within the VPC.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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