CLF-C02 Cloud Technology and Services Practice Question
A company runs an e-commerce application on Amazon EC2 instances in the us-east-1 Region. The application serves static assets (images, CSS files) and dynamic API responses. Users in Europe and Asia report that the website loads slowly, especially for images. The company needs a solution that reduces latency for both static and dynamic content by caching static assets at edge locations and accelerating dynamic API calls using optimized network paths. Which AWS service should the company use?
⚠ Common exam trap
Test-takers frequently confuse AWS Global Accelerator (which optimizes dynamic traffic only) with CloudFront (which handles both caching and acceleration), failing to recognize that caching static assets is a requirement that only a CDN like CloudFront can fulfill.
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
✓
Amazon CloudFront
Amazon CloudFront is a content delivery network (CDN) that caches static assets (images, CSS files) at edge locations worldwide, reducing latency for users in Europe and Asia. It also supports dynamic API acceleration by using optimized network paths (AWS global network backbone) and features like origin shield and TCP optimizations, making it the correct choice for both static and dynamic content.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Amazon CloudFront
Why this is correct
Amazon CloudFront is a global content delivery network (CDN) that caches static assets such as images, CSS, and JavaScript at edge locations close to users, dramatically reducing latency for a worldwide customer base. For dynamic content, it terminates user connections at the edge and forwards requests to the origin over AWS's private backbone network, improving response times for personalized e-commerce pages and API calls. By combining edge caching with optimized routing, CloudFront directly addresses the requirement to reduce latency for a global audience.
- ✗
AWS Global Accelerator
Why it's wrong here
Global Accelerator improves latency for TCP/UDP traffic by routing users to the nearest edge location and then over the AWS global network, but it does not cache static content. It is not the best choice for serving cached images.
When this WOULD be correct
A company needs to improve availability and performance for a global application that uses UDP or TCP protocols (e.g., gaming, IoT, or VoIP) and requires static IP addresses for whitelisting, with no need for content caching.
- ✗
Amazon S3 Transfer Acceleration
Why it's wrong here
Amazon S3 Transfer Acceleration uses edge locations to speed up multi-part uploads from clients to an S3 bucket, which is useful for ingesting large files, but it does not accelerate downloads or API calls delivered from the e-commerce application to end users. It is a write-acceleration feature for the storage layer, not a read-side CDN or edge-caching service, so it cannot cache images or reduce latency for customers browsing the site. Since the concern is global user latency for web traffic, Transfer Acceleration does not solve the content-delivery problem and is therefore incorrect.
When this WOULD be correct
A company needs to upload large files (e.g., video archives, backups) to an S3 bucket from geographically distant locations and wants to minimize upload latency by using optimized network paths.
- ✗
Application Load Balancer
Why it's wrong here
An Application Load Balancer operates at the application layer (HTTP/HTTPS) and distributes incoming traffic across EC2 instances within a single AWS Region, but it does not cache content or shorten the network path between a distant user and the origin server. It is essential for scaling and high availability of the compute fleet, yet it has no edge locations and cannot reduce latency for users located far from the Region. Because the e-commerce application serves a global audience, an ALB alone cannot satisfy the requirement for improved response times across geographies.
When this WOULD be correct
An Application Load Balancer would be correct when the question asks for distributing incoming HTTP/HTTPS traffic across multiple targets (e.g., EC2 instances, containers) within a single region, with features like path-based routing, SSL termination, and health checks, without requiring global edge caching or network acceleration.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Amazon CloudFrontCorrect answer▾
Why this is correct
Amazon CloudFront is a global content delivery network (CDN) that caches static assets such as images, CSS, and JavaScript at edge locations close to users, dramatically reducing latency for a worldwide customer base. For dynamic content, it terminates user connections at the edge and forwards requests to the origin over AWS's private backbone network, improving response times for personalized e-commerce pages and API calls. By combining edge caching with optimized routing, CloudFront directly addresses the requirement to reduce latency for a global audience.
✗AWS Global AcceleratorWrong answer — click to see why▾
Why this is wrong here
AWS Global Accelerator improves performance for dynamic content via optimized network paths but does not cache static assets at edge locations; it lacks the content caching capabilities required for images and CSS files.
★ When this WOULD be the correct answer
A company needs to improve availability and performance for a global application that uses UDP or TCP protocols (e.g., gaming, IoT, or VoIP) and requires static IP addresses for whitelisting, with no need for content caching.
Why candidates choose this
Candidates may confuse Global Accelerator's edge location optimization with CloudFront's caching, assuming both provide similar performance improvements for static and dynamic content without understanding the caching distinction.
✗Amazon S3 Transfer AccelerationWrong answer — click to see why▾
Why this is wrong here
Amazon S3 Transfer Acceleration only speeds up uploads to S3 buckets, not delivery of static assets or acceleration of dynamic API calls via edge caching or optimized network paths.
★ When this WOULD be the correct answer
A company needs to upload large files (e.g., video archives, backups) to an S3 bucket from geographically distant locations and wants to minimize upload latency by using optimized network paths.
Why candidates choose this
Candidates may confuse 'acceleration' with edge caching and assume S3 Transfer Acceleration improves content delivery, not just uploads.
✗Application Load BalancerWrong answer — click to see why▾
Why this is wrong here
An Application Load Balancer distributes traffic across EC2 instances but does not cache static assets at edge locations or accelerate dynamic API calls via optimized network paths; it operates only within a region and lacks global edge caching and network optimization.
★ When this WOULD be the correct answer
An Application Load Balancer would be correct when the question asks for distributing incoming HTTP/HTTPS traffic across multiple targets (e.g., EC2 instances, containers) within a single region, with features like path-based routing, SSL termination, and health checks, without requiring global edge caching or network acceleration.
Why candidates choose this
Candidates may mistakenly think an ALB can improve latency because it can offload SSL and route traffic efficiently, but they overlook that it does not provide edge caching or global network acceleration, which are essential for reducing latency for users worldwide.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services 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 CLF-C02 exam.