SAA-C03 Design High-Performing Architectures Practice Question
A media company is designing a high-performance architecture to serve video content to users worldwide. The solution must minimize latency for end users and reduce the load on the origin servers. The video files are stored in an Amazon S3 bucket. Which three options should be combined to meet these requirements? (Choose three.)
⚠ Common exam trap
Test-takers frequently confuse S3 Transfer Acceleration (which optimizes uploads) with CloudFront (which optimizes downloads), or think that ElastiCache can be used as a CDN for video content, when it is actually an in-memory cache for application data, not for serving static files at the edge.
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
✓
Use Amazon CloudFront as a content delivery network (CDN) with the S3 bucket as the origin.
Amazon CloudFront as a CDN with the S3 bucket as the origin minimizes latency by caching video content at edge locations worldwide, serving users from the nearest edge. This reduces load on the origin S3 bucket by handling requests at the edge. Regional Edge Caches further improve cache hit ratios for less popular content by caching it at regional locations, reducing the need to fetch from the origin. Origin shield in CloudFront consolidates requests from multiple edge locations into a single request to the S3 origin, significantly reducing the number of direct requests and lowering origin load.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use Amazon CloudFront as a content delivery network (CDN) with the S3 bucket as the origin.
Why this is correct
Using Amazon CloudFront as a Content Delivery Network (CDN) with an S3 bucket as the origin is a foundational architecture for high-performance video delivery. CloudFront caches video content at global edge locations, significantly reducing latency for viewers and offloading requests from the S3 origin, which provides highly durable and scalable storage for the video files.
- ✗
Enable S3 Transfer Acceleration on the bucket to speed up uploads.
Why it's wrong here
S3 Transfer Acceleration is designed to speed up data *uploads* to S3 buckets, particularly from clients geographically distant from the bucket's region. The question focuses on *serving* video content, which involves downloads/reads by viewers. Therefore, while useful for content ingestion, it does not directly improve the performance of content delivery to end-users.
- ✓
Configure CloudFront to use Regional Edge Caches to improve cache hit ratios for less popular content.
Why this is correct
Configuring CloudFront to utilize Regional Edge Caches improves cache hit ratios by providing a larger, intermediate caching layer between edge locations and the origin. This is particularly beneficial for less popular content that might be evicted from smaller edge caches but is still accessed frequently within a region, reducing the need to fetch it repeatedly from the origin.
- ✗
Use Amazon ElastiCache for Memcached to cache video metadata at the edge.
Why it's wrong here
Amazon ElastiCache for Memcached is a managed in-memory caching service typically deployed within an AWS VPC in a specific region. It is not designed to operate at CloudFront's global edge locations, which are geographically distributed points of presence. CloudFront's own caching mechanisms handle content and metadata caching at the edge.
- ✗
Enable S3 default encryption using AWS KMS to improve data transfer performance.
Why it's wrong here
Enabling S3 default encryption using AWS Key Management Service (KMS) secures data at rest within the S3 bucket, fulfilling security and compliance requirements. However, encryption and decryption operations, especially when integrated with KMS, introduce processing overhead. This process does not improve data transfer performance; rather, it can marginally increase the time required for data access.
- ✓
Implement origin shield in CloudFront to reduce the number of requests sent to the S3 origin.
Why this is correct
Implementing Origin Shield in CloudFront provides an additional, centralized caching layer positioned closest to the origin server. It acts as a single aggregation point for all requests from CloudFront's global network of edge locations and regional edge caches, consolidating requests and preventing multiple cache misses from simultaneously hitting the S3 origin, thereby significantly reducing origin load.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAA-C03 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 SAA-C03 exam.