What best describes a 2-tier architecture in networking?

A 2-tier architecture in networking is characterized by a configuration where a client is directly connected to a server. In this model, the client is typically responsible for the user interface and presentation layer, while the server handles the data access and processing layer. This direct communication simplifies the architecture by having only two layers: the client-tier and the server-tier, enhancing interaction efficiency.

This model is commonly used in applications where a straightforward and efficient interaction between the client and server is desired, allowing for quick data retrieval without the need for intermediary layers or additional complexity. The simplicity of a 2-tier architecture can often lead to improved performance, especially in environments where rapid data access is crucial.

In contrast, an architecture involving multiple servers communicating with one another tends to lean towards a more complex multi-tier or distributed architecture, which does not align with the definition of a 2-tier system. Similarly, a three hierarchical layer structure would be indicative of a 3-tier architecture commonly used in larger systems for scalability and load balancing, and a design focused on optimizing database queries, while important, is not a defining characteristic of a 2-tier architecture.