Answer: A.
Option A is CORRECT.
Responses cached at the CloudFront edge locations reduce the load on origin servers as responses are served from the CloudFront edge location.
Option B is INCORRECT.
Applications cannot be hosted on edge locations.
Option C is INCORRECT.
Databases cannot be hosted on edge locations.
Option D is INCORRECT.
EC2 servers cannot be hosted on edge locations.
Reference:
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/cache-hit-ratio-explained.html https://wa.aws.amazon.com/wat.concept.edge-location.en.html
AWS Edge locations are a part of Amazon Web Services' global infrastructure and are used to improve the performance and availability of web applications and content for end-users. These edge locations act as a cache and a proxy server between the user and the origin server, which is typically located in a centralized location.
The correct statement representing the use of AWS Edge locations is option B, which says that it eases (reduces) the latency and network traffic by hosting applications at locations closer to the end-users. This is achieved by replicating the content from the origin server to the edge location, which is located closer to the end-users. This replication is done using Amazon CloudFront, a global content delivery network that caches the content from the origin server and distributes it to the edge locations around the world.
When a user requests a web application or content, the request is routed to the nearest edge location, which then serves the content from its cache, reducing the round trip time for the request and response. This reduces the latency and network traffic as the content is served from the edge location rather than from the origin server.
Option A is incorrect as it refers to the use of a cache at the edge location to reduce the load on the origin server, which is a secondary effect of edge locations. Option C is incorrect as it refers to hosting databases at edge locations, which is not a typical use case for edge locations. Option D is incorrect as it refers to hosting EC2 servers at edge locations, which is not a typical use case for edge locations either.
In summary, AWS Edge locations are used to improve the performance and availability of web applications and content by caching the content at locations closer to the end-users, which reduces the latency and network traffic.
