Enterprise composite model

brief overview to previous model just in case

Cisco Hierarchical Network Model

• Access Layer - user access to the network and assigning them to VLANs. Avoid implementing network policies here to avoid complexity, costs, and slow down of devices.
• Distribution Layer - aggregates the wiring closets and uses the switches to create functional separation of workgroups and networks. Also aggregates WAN connection at the edge of the campus. Act as intermediate devices that route them between VLANs. Also used to apply policy-based connectivity, such as firewall or QoS.
• Core Layer (Backbone) - high-speed backbone designed to switch packets as fast as possible. It is not a good idea to implement traffic policies here as well as it would slow down the devices, which goes against its purpose to move traffic quickly.

Enterprise Composite Model



Now what the hell this is ill try to explain

A newer design compared to the older Cisco hierarchical model. It expands from the older model by making some specific recommendations about how and where certain network functions should be implemented.

• Enterprise Campus - it contains the following components:
  • Building - houses the access switches and end user devices
  • Building distribution - includes the distribution switches
  • Core - the campus backbone that provides high speed access between buildings
  • Edge distribution - interface in between the Enterprise Campus and the Enterprise Edge
  • Server farm - the campus data center
  • Management - management functionalities such as monitoring logging, security, etc.
• Enterprise Edge - connects the enterprise campus to the WAN. Includes the following components:
  • E-commerce - network components that provide e-commerce functionality such as online ordering system.
  • Corporate Internet - provides internet services and access.
  • VPN and Remote Access - where remote VPN access from remote users terminate
  • WAN - provides connectivity to remote sites.
• Service Provider Edge - includes:
  • ISP - services the internet connection
  • PSTN - non-permanent connections such as dial-up, analog phones, cell phones and ISDN
  • Frame Relay, ATM, and PPP connectivity - permanent connections to remote locations.