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GCDL Practice Question: A company's security team wants to control which…
This GCDL practice question tests your understanding of a company's security team wants to control which…. 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's security team wants to control which resources on the internet can communicate with their virtual machines in Google Cloud. Which fundamental cloud networking concept provides this control?
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
Cloud Storage bucket policies that restrict access to VM storage volumes
Cloud Storage bucket policies control access to object storage (files in buckets), not network connectivity to VM instances. These are entirely different resources and access control mechanisms.
B
Distractor review
DNS records that determine which internet addresses can resolve the VM's hostname
DNS resolves hostnames to IP addresses. Having a DNS record that resolves to a VM's IP doesn't control whether connections are accepted — firewall rules control that. DNS and firewall rules are independent mechanisms.
C
Best answer
VPC firewall rules that control inbound and outbound network traffic to VMs based on IP ranges, protocols, and ports
VPC firewall rules are the correct answer. They are stateful, software-defined firewalls applied to VM network interfaces in Google Cloud VPCs. Rules specify what traffic is allowed or denied based on source/destination IPs, protocols, and ports — providing precise control over which internet resources can communicate with the VMs.
D
Distractor review
Cloud IAM policies that grant or deny permissions for external systems to access VM resources
IAM controls authentication and authorization for Google Cloud management plane operations (console, API calls). It doesn't control network-level connectivity between internet hosts and VM instances — that's VPC firewall rules.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Related practice questions
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: VPC firewall rules that control inbound and outbound network traffic to VMs based on IP ranges, protocols, and ports — Firewall rules (in Google Cloud, implemented as VPC firewall rules) control inbound and outbound network traffic to cloud resources based on rules that specify: source/destination IP ranges, protocols (TCP, UDP, ICMP), and port numbers. Firewall rules are the fundamental mechanism for network access control in cloud environments, equivalent to traditional network firewalls but software-defined and managed through APIs.
What should I do if I get this GCDL question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related GCDL NAT questions on configuration and troubleshooting.
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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.