Cloud Digital Leader Trust and security with Google Cloud Practice Question
This GCDL practice question tests your understanding of trust and security with google cloud. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 small e-commerce company runs its website on Compute Engine instances behind a Global External HTTP(S) Load Balancer. They are concerned about application-layer DDoS attacks, such as SQL injection and cross-site scripting (XSS), that could compromise customer data and degrade performance. The company wants a managed solution that provides both DDoS protection and web application firewall (WAF) capabilities without requiring constant manual updates. They have a limited budget and prefer a solution that is easy to configure and does not require extensive infrastructure changes. What should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Cloud Armor with preconfigured WAF rules and configure it on the load balancer.
Cloud Armor is a managed, Google Cloud-native service that provides both DDoS protection and a web application firewall (WAF) with preconfigured rules for SQL injection and XSS. It integrates directly with the Global External HTTP(S) Load Balancer, requires no manual updates (rules are maintained by Google), and is cost-effective because it charges based on policy usage rather than infrastructure overhead. This meets the company's need for easy configuration, minimal infrastructure changes, and managed security.
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.
✓
Enable Cloud Armor with preconfigured WAF rules and configure it on the load balancer.
Why this is correct
Cloud Armor offers DDoS protection and WAF rules that can be easily applied to a load balancer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure VPC firewall rules to block suspicious IP addresses.
Why it's wrong here
Firewall rules operate at the network layer and cannot inspect application payloads.
✗
Set up Cloud NAT to route all traffic through a single IP address.
Why it's wrong here
Cloud NAT is for outbound traffic only and does not provide DDoS protection or WAF.
✗
Use Cloud VPN to connect users to the load balancer.
Why it's wrong here
Cloud VPN secures connections but does not protect against DDoS or application attacks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse network-layer security tools (VPC firewall rules, Cloud NAT, Cloud VPN) with application-layer security, assuming any Google Cloud networking feature can block web attacks, but only Cloud Armor provides managed WAF and DDoS protection at the application layer.
Detailed technical explanation
How to think about this question
Cloud Armor uses a rule engine that evaluates HTTP(S) requests against preconfigured WAF rules (e.g., OWASP ModSecurity Core Rule Set) and custom rules, applying actions like allow, deny, or rate limiting at the load balancer edge before traffic reaches backend instances. Under the hood, it leverages Google's global infrastructure to absorb volumetric DDoS attacks (up to Tbps) and uses a stateful session-based engine for application-layer inspection, which can detect encoded or obfuscated injection attempts. In a real-world scenario, a company might combine Cloud Armor with Google Cloud's DDoS Protection (Always On) to automatically mitigate both Layer 3/4 and Layer 7 attacks without manual intervention.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this GCDL question in full detail.
Trust and security with Google Cloud — This question tests Trust and security with Google Cloud — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Cloud Armor with preconfigured WAF rules and configure it on the load balancer. — Cloud Armor is a managed, Google Cloud-native service that provides both DDoS protection and a web application firewall (WAF) with preconfigured rules for SQL injection and XSS. It integrates directly with the Global External HTTP(S) Load Balancer, requires no manual updates (rules are maintained by Google), and is cost-effective because it charges based on policy usage rather than infrastructure overhead. This meets the company's need for easy configuration, minimal infrastructure changes, and managed security.
What should I do if I get this GCDL 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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