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GCDL Practice Question: A company hosts a web application that receives…
This GCDL practice question tests your understanding of a company hosts a web application that receives…. 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 company hosts a web application that receives requests from users globally. To handle failures, they run three identical copies of their application behind a load balancer. When one copy fails, the load balancer automatically stops sending traffic to it. What load balancing feature enables this?
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
Round-robin distribution — traffic cycles evenly across all instances regardless of health.
Round-robin distributes traffic evenly but doesn't account for instance health. Without health checks, round-robin continues sending requests to failed instances.
B
Best answer
Health checks — the load balancer probes backend instances and removes unhealthy ones from the serving pool.
Health checks detect failed backends by sending periodic probe requests. Unhealthy backends are removed from rotation; remaining healthy instances absorb the traffic. This is automatic fault detection.
C
Distractor review
Session affinity — routing the same user to the same backend instance.
Session affinity (sticky sessions) routes a user consistently to the same backend for stateful applications. It doesn't automatically remove failed backends from rotation.
D
Distractor review
SSL termination — decrypting HTTPS traffic before forwarding to backends.
SSL termination decrypts encrypted traffic at the load balancer, not a health or availability feature. It handles encryption, not fault detection.
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.
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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: Health checks — the load balancer probes backend instances and removes unhealthy ones from the serving pool. — Health checks are the mechanism by which load balancers verify that backend instances are operational. The load balancer regularly sends probe requests to each backend. If a backend fails health checks (doesn't respond, returns an error), the load balancer marks it as unhealthy and stops routing traffic to it. Traffic is redistributed to the remaining healthy backends. This is the core mechanism enabling automatic fault tolerance in load-balanced architectures.
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.