The following two modules and their associated devices, shown in Figure 13-1, make up the small network design:
Corporate Internet module
Campus module
NOTE
Figure 13-1 also shows an ISP module, for clarity, but it is not considered a part of the small network design model.
The Corporate Internet module provides connectivity to the Internet and terminates any VPN connectivity. Traffic for public services such as mail, web, file transfer, and name lookups are also terminated at the Corporate Internet module.
The Campus module incorporates the internal Layer 2 switching, including corporate users, corporate intranet servers, and management servers.