A network uses one pair of Layer 3 switches for core and distribution purposes. Which design is this network using?

Collapsed Layer 3 core is not a standard or distinct networking design term; 'collapsed core' already implies the combination of core and distribution functions at Layer 3.

Collapsed Layer 2-3 is an ambiguous term that does not precisely describe the standard network design where core and distribution layers are combined.

Collapsed distribution refers only to the distribution layer, but the question clearly states that both core and distribution purposes are handled by a single pair of switches, indicating a combined core and distribution layer.

A collapsed core design combines the core and distribution layers of a traditional three-tier hierarchical network into a single layer of switches. This approach simplifies the network architecture, reduces latency, and lowers equipment costs, making it suitable for smaller to medium-sized networks where the full three-tier model is not necessary.