What type of scalability does a CDN represent, where additional servers are added to help handle the same workload?

The correct response identifies horizontal scalability as the type of scalability represented by a Content Delivery Network (CDN). In horizontal scalability, additional servers or nodes are added to distribute the load effectively across multiple devices. This allows for handling more requests simultaneously without having to increase the power of existing servers, making it particularly efficient for managing high traffic and large amounts of data.

In the context of CDNs, they work by deploying numerous servers across various geographical locations. When a user requests content, it is typically served from the nearest data center, reducing latency and improving load times. As demand increases, more servers can be added to accommodate the additional traffic, illustrating the essence of horizontal scalability.

This method is in contrast to vertical scalability, where a single server is upgraded to improve its capacity (like adding more RAM or CPU). Redundant scaling could imply duplicating existing resources for reliability rather than clumping together to manage a single workload, and there isn’t a specific concept known as cloud scaling that captures the essence of how CDNs manage workloads. Thus, horizontal scalability is the most accurate characterization of how CDNs function to manage increasing demands efficiently.