Cloud Digital Leader Fundamental Cloud Concepts Practice Question
An e-commerce company experiences unpredictable traffic spikes. They need to ensure their web application automatically scales out during high demand and scales in when demand drops, paying only for resources used. Which cloud benefit best describes this?
⚠ Common exam trap
The trap is confusing elasticity with scalability or reliability; candidates may pick reliability because it sounds like a benefit, but the key phrase is 'automatically scales out and scales in' which defines elasticity.
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
✓
Elasticity
Elasticity is the cloud characteristic that allows resources to automatically scale out during demand spikes and scale in when demand drops, so the company pays only for what it uses. This matches the e-commerce scenario of unpredictable traffic. It is a core benefit of cloud computing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Economies of scale
Why it's wrong here
Economies of scale lower the per-unit cost of infrastructure due to large-scale operations, but they do not dynamically adjust capacity to match demand. An e-commerce platform facing unpredictable traffic spikes needs active resource provisioning that reacts in real time, not merely cheaper baseline pricing. Thus, while the cloud provider benefits from cost reduction, it is not the characteristic that solves the spike problem.
- ✗
Broad network access
Why it's wrong here
Broad network access means that cloud services are reachable over the network using standard protocols from a wide range of client devices. It describes how users connect to resources, not how those resources grow or shrink with workload. For unpredictable spikes, the enabling capability is the automatic scaling of compute/storage capacity, not the transport mechanism itself.
- ✓
Elasticity
Why this is correct
Elasticity is the cloud attribute that provisions and releases IT resources automatically to match current demand, often via auto-scaling policies or real-time monitoring. For an e-commerce site, this means adding virtual servers during a flash sale and removing them after the surge, preventing both over-provisioning and performance degradation. This dynamic, bidirectional scaling is exactly what addresses unpredictable traffic spikes.
- ✗
Reliability
Why it's wrong here
Reliability focuses on a system's ability to remain operational and recover from failures, using redundancy, failover, and health checks. While maintaining uptime during a spike is important, reliability does not imply the capacity itself changes; a reliable but static infrastructure would still be overwhelmed. The specific cloud advantage for variable demand is elasticity, not fault tolerance.
Go deeper
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High Availability: 99.9% vs 99.99% vs 99.999%
Key term
Cloud computing
Cloud computing is the on-demand delivery of IT resources over the internet, allowing users to access computing power, storage, and applications without owning physical hardware.
Key term
Elasticity
Elasticity is the ability of a cloud system to automatically add or remove computing resources (like servers, storage, or bandwidth) in response to real-time changes in demand.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Google Cloud exam blueprint
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.