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GCDL Practice Question: A Virtual Private Cloud (VPC) in Google Cloud…
This GCDL practice question tests your understanding of a virtual private cloud (vpc) in google cloud…. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Virtual Private Cloud (VPC) in Google Cloud provides network isolation. What does 'network isolation' mean in this context, and why is it important?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
A VPC requires dedicated physical hardware separate from other customers to ensure isolation.
VPCs are logical (software-defined) isolation — multiple customers share physical hardware while their network traffic is isolated through software-defined networking. Physical separation would be very expensive and unnecessary.
B
Distractor review
Network isolation means all traffic within the VPC is automatically encrypted.
VPC isolation is about network boundary enforcement (routing), not encryption. Traffic within a VPC is not automatically encrypted at the application layer — that requires TLS/application-level encryption.
C
Best answer
VPC provides a logically isolated private network where resources are separated from other customers' networks by default, preventing unauthorized cross-customer traffic.
VPCs create private network boundaries. Customer A's VMs and customer B's VMs cannot see each other's network traffic even though they share physical infrastructure — logical isolation is enforced at the network layer.
D
Distractor review
Network isolation means the VPC blocks all internet access — resources cannot communicate with external services.
VPC isolation prevents unauthorized cross-customer communication, not all internet access. Resources in a VPC can still access the internet via Cloud NAT or external IPs unless explicitly restricted.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related GCDL practice-question pages
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More questions from this exam
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Question 1
A traditional retailer currently maintains its own data centers, purchasing servers every 3–5 years and paying for facilities, power, and staff regardless of demand. When it migrates its workloads to the public cloud, which change in cost model does it experience?
Question 2
An e-commerce company plans its infrastructure for peak shopping events (e.g., Black Friday) which drive 50× normal traffic. On-premises, they must maintain 50× capacity year-round. In the cloud, they provision 50× capacity only during peak periods. Which cloud characteristic enables this cost optimization?
Question 3
Which term describes the process by which organizations integrate digital technology into all areas of their business, fundamentally changing how they operate and deliver value to customers?
Question 4
When a company moves from maintaining its own data center to using Google Cloud, which operational responsibility does Google assume that the company previously managed?
Question 5
A hospital runs a patient records system that must remain on-premises due to strict regulatory data residency requirements. However, they also want to use cloud-based AI for diagnostic imaging analysis. Which cloud deployment model best describes their architecture?
Question 6
What is virtualization in the context of cloud computing, and why is it fundamental to how cloud providers deliver services?
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FAQ
Questions learners often ask
What does this GCDL question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: VPC provides a logically isolated private network where resources are separated from other customers' networks by default, preventing unauthorized cross-customer traffic. — A VPC creates a logically isolated private network within Google Cloud. Resources in different VPCs cannot communicate with each other by default, even if they're in the same Google Cloud project. This isolation means a customer's VMs, databases, and services are separated from other customers' resources on the shared physical infrastructure — no cross-customer network traffic is possible. Within a VPC, subnets further segment network space by region.
What should I do if I get this GCDL 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 GCDL subnetting questions on CIDR, address ranges, and subnet selection.
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This GCDL 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 GCDL exam.