- WAN edge
- data center
- Internet edge
- network services
Explanation: In this hierarchical model, the distribution/core layer provides connectivity to the WAN edge block, the Internet edge block, the network services block, and data center. The WAN edge block is used to connect to remote data centers, remote branches or other campus networks. The Internet edge block is used for regular Internet access, ecommerce, to connect to remote branches, and remote VPN access. The data center/server room block is where business critical servers are placed to serve up websites, corporate e-mail, business applications, storage, big data processing, and backup services. The network services edge is where devices providing network services reside such as the Wireless LAN Controllers (WLCs), Identity Services Engine (ISE), Telepresence Manager, and Cisco Unified Communications Manager (CUCM).
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