Foundation Topics 47
Foundation Topics
The discussions in this chapter revolve around a fictitious, albeit typical, network topology.
Figure 3-2 depicts that topology.
Figure 3-2
Network Topology for Chapter Discussion
Figure 3-2 depicts a number of technologies in the network. These technologies (ISDN, Frame
Relay, X.25, and so on) are discussed in this book at various times and are not discussed in this
chapter.
You must understand the concepts and components involved in properly connecting WAN
devices. Frame Relay, ISDN (BRI and PRI), and other Layer 2 technologies are necessary
implementation in your WAN deployment. Choosing the proper technology is a decision that is
based on the goals of the network at each step.
The goals of the network must be laid out ahead of time. Some of the questions you should
consider include
·
What do you wish to gain from this specific deployment?
·
How many users must it support?
·
How much bandwidth is necessary to support the applications in use at each site?
·
Which router model(s) support the needs of the site?
Central site
Cisco 3600
1.544 Mbps
ISDN BRI
ISDN BRI
Cisco 1700
Branch Office B
256 kbps
64 kbps
Branch Office A
Cisco 1700
ISDN/Analog
Frame Relay