3.1.3 Developing a Modular Diagram
The stadium network has grown significantly from its initial design. The NetworkingCompany designer takes the logical diagram and organizes the network into a modular block diagram.
A modular block diagram is a simplified version of the network. The diagram shows the major functions in modular form. It helps the designer to determine the underlying architecture on which the network is built.
The designer compares the block diagram to the ideal network design represented by the Cisco Enterprise Network Architectures. The designer identifies areas that must be redesigned or upgraded.
The initial architecture of the stadium network is a large flat network. It has only two physical layers of switches. Some of the switches provide end device connectivity to the network and some interconnect other switches. Both layers are built using Layer 2 switches, which are not segmented by VLANs.
Server locations are at various points within the network.
Internet connectivity is provided through another router. Connectivity is protected by a firewall and IDS. Both of the remote locations connect to the stadium network through VPNs that terminate at the Internet router.