What it is: AWS Content Delivery Network (CDN) that delivers content via edge locations.

What it’s for:

• Speed up delivery of websites, images, videos, APIs (in some cases).
• Add security features like HTTPS, WAF integration, DDoS protection (via Shield).

Core components:

• Distribution: CloudFront configuration.
• Origin: where CloudFront fetches content (S3, ALB, EC2, custom).
• Cache behavior: rules for caching, headers, cookies, query strings.
• TTL: cache time-to-live.

Exam cues:

• “global users, faster static content” → CloudFront.
• “reduce load on origin” → caching with CloudFront.

Hard words:

• *distribution* /ˌdɪstrɪˈbjuːʃn/: phân phối/cấu hình phân phối
• *behavior* /bɪˈheɪvjər/: hành vi (rule xử lý)
• *cookie* /ˈkʊki/: cookie
• *query string* /ˈkwɪri strɪŋ/: chuỗi tham số URL
• *time-to-live (TTL)* /ˌtaɪm tə ˈlɪv/: thời gian sống (thời hạn cache)