Internetworking—the communication between two or more networks—encompasses every aspect
of connecting computers together. Internetworks have grown to support vastly disparate
end-system communication requirements. An internetwork requires many protocols and features to
permit scalability and manageability without constant manual intervention. Large internetworks can
consist of the following three distinct components:
• Campus networks, which consist of locally connected users in a building or group of buildings
• Wide-area networks (WANs), which connect campuses together
• Remote connections, which link branch offices and single users (mobile users and/or
telecommuters) to a local campus or the Internet
Figure 1-1 provides an example of a typical enterprise internetwork
of connecting computers together. Internetworks have grown to support vastly disparate
end-system communication requirements. An internetwork requires many protocols and features to
permit scalability and manageability without constant manual intervention. Large internetworks can
consist of the following three distinct components:
• Campus networks, which consist of locally connected users in a building or group of buildings
• Wide-area networks (WANs), which connect campuses together
• Remote connections, which link branch offices and single users (mobile users and/or
telecommuters) to a local campus or the Internet
Figure 1-1 provides an example of a typical enterprise internetwork
Designing an internetwork can be a challenging task. To design reliable, scalable internetworks,
network designers must realize that each of the three major components of an internetwork have
distinct design requirements. An internetwork that consists of only 50 meshed routing nodes can
pose complex problems that lead to unpredictable results. Attempting to optimize internetworks that
feature thousands of nodes can pose even more complex problems.
Despite improvements in equipment performance and media capabilities, internetwork design is
becoming more difficult. The trend is toward increasingly complex environments involving multiple
media, multiple protocols, and interconnection to networks outside any single organization’s
dominion of control. Carefully designing internetworks can reduce the hardships associated with
growth as a networking environment evolves.
This chapter provides an overview of the technologies available today to design internetworks.
Discussions are divided into the following general topics:
• Designing Campus Networks
• Designing WANs
• Utilizing Remote Connection Design
• Providing Integrated Solutions
• Determining Your Internetworking Requirements
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