Which three are network layers of the Cisco architectural design? (Choose three.)

A.
access

B.
consolidation

C.
switch

D.
distribution (aggregation)

E.
core

F.
server

Explanation:
Cisco models architectural design on a simple model of core, aggregation, and access. This model is conceptual and can be applied to a physical architecture. The core of the network should be the most stable, provide the fastest bandwidth possible, and make flow decisions based on a number of criteria including physical and virtual location. The aggregation layer aggregates switches, isolates failure domains, interconnects campus resources, and connects branch and WAN networks. The server and storage access layer is how servers and storage devices gain access to resources such as SANs, high-performance clusters and grids, and the IP network.