- A
VPC: A global, isolated virtual network that spans all regions.
Correct. VPC is a global, isolated virtual network spanning all regions.
- B
Subnet: A regional subnet within a VPC, used to assign IP addresses to resources.
Correct. Subnet is a regional subnet within a VPC for IP assignment.
- C
Firewall Rules: Rules that control inbound and outbound traffic to/from VM instances.
Correct. Firewall Rules control traffic to/from VM instances.
- D
Cloud Router: A managed service that provides outbound internet access for private instances via NAT.
Why wrong: Wrong. The definition describes Cloud NAT, not Cloud Router. Cloud Router uses BGP to exchange routes between VPC and on-premises.
- E
Cloud NAT: A managed service that dynamically exchanges routes between VPC and on-premises networks using BGP.
Why wrong: Wrong. The definition describes Cloud Router, not Cloud NAT. Cloud NAT provides outbound internet access for private instances.
- F
VPC Peering: A direct private connection between two VPC networks.
Correct. VPC Peering is a direct private connection between two VPCs.
Key GCP Networking Concepts: VPC, Subnet, Firewall, Cloud NAT, etc.
This PCA practice question tests your understanding of ensure solution and operations reliability. 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.
Match each GCP networking concept to its definition.
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
VPC: A global, isolated virtual network that spans all regions.
The correct matches are A, B, C, and F. Option A correctly defines VPC as a global isolated virtual network. Option B correctly defines Subnet as a regional subnet within a VPC. Option C correctly defines Firewall Rules as traffic control rules. Option F correctly defines VPC Peering as a direct private connection. Options D and E are incorrect because their definitions are swapped: Cloud Router uses BGP for dynamic routing (not NAT), and Cloud NAT provides outbound internet access via NAT (not BGP). Therefore, D and E are wrong.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VPC: A global, isolated virtual network that spans all regions.
Why this is correct
Correct. VPC is a global, isolated virtual network spanning all regions.
Related concept
CIDR notation defines the prefix length.
- ✓
Subnet: A regional subnet within a VPC, used to assign IP addresses to resources.
Why this is correct
Correct. Subnet is a regional subnet within a VPC for IP assignment.
Related concept
CIDR notation defines the prefix length.
- ✓
Firewall Rules: Rules that control inbound and outbound traffic to/from VM instances.
- ✗
Cloud Router: A managed service that provides outbound internet access for private instances via NAT.
- ✗
Cloud NAT: A managed service that dynamically exchanges routes between VPC and on-premises networks using BGP.
Why it's wrong here
Wrong. The definition describes Cloud Router, not Cloud NAT. Cloud NAT provides outbound internet access for private instances.
- ✓
VPC Peering: A direct private connection between two VPC networks.
Why this is correct
Correct. VPC Peering is a direct private connection between two VPCs.
Related concept
CIDR notation defines the prefix length.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCA subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this PCA question test?
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: VPC: A global, isolated virtual network that spans all regions. — The correct matches are A, B, C, and F. Option A correctly defines VPC as a global isolated virtual network. Option B correctly defines Subnet as a regional subnet within a VPC. Option C correctly defines Firewall Rules as traffic control rules. Option F correctly defines VPC Peering as a direct private connection. Options D and E are incorrect because their definitions are swapped: Cloud Router uses BGP for dynamic routing (not NAT), and Cloud NAT provides outbound internet access via NAT (not BGP). Therefore, D and E are wrong.
What should I do if I get this PCA question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCA subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: Jun 11, 2026
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