What type of scaling involves replacing a server with another that has more capabilities?

Vertical scaling, often referred to as "scaling up," involves increasing the capabilities of a single server by adding more powerful hardware components, such as a faster CPU, additional RAM, or more storage. This method allows for the enhancement of a server's performance and its ability to handle increased loads or processes without the need to distribute the workload across multiple servers.

In a cloud environment, vertical scaling is convenient when you have a limited number of applications that cannot be easily split across several servers. It allows organizations to improve performance efficiently by upgrading their existing infrastructure rather than managing multiple servers.

The other scaling methods typically involve different approaches to resource management. Horizontal scaling (or scaling out) adds more servers to the pool to distribute the load, while elasticity involves dynamically adjusting resources to meet changing demands. Round-robin is a load balancing technique rather than a scaling method, focusing on evenly distributing traffic across existing resources. Therefore, vertical scaling specifically pertains to replacing or enhancing a server with one that possesses superior capabilities.