CCNA Data Center DCICT 640-916 Official Cert Guide

Aggregation Layer

The aggregation (or distribution) layer aggregates the uplinks from the access layer to the data center core. This layer is the critical point for control and application services. Security and application service devices (such as load-balancing devices, SSL offloading devices, firewalls, and IPS devices) are often deployed as a module in the aggregation layer. This design lowers TCO and reduces complexity by reducing the number of components that you need to configure and manage.

Note

In traditional multilayer data center design, service devices that are deployed at the aggregation layer are shared among all the servers. Service devices that are deployed at the access layer provide benefit only to the servers that are directly ...