tools. Recurring costs are the monthly circuit fees from the service provider. The ongoing
salaries of the information technology personnel who support and maintain the network must
be considered a recurring cost.
design optimizes application availability while maximizing the cost-effective use of network
resources. The goal is to minimize cost based on these elements while delivering service that
does not compromise established availability requirements. These design factors will always be
at odds. When used at its maximum, each becomes a trade-off of the other. Any increase in
availability must generally be reflected as an increase in cost. As a result, the CCDP must
carefully weigh the relative importance of resource availability and overall cost.
about the status of the design project. When the lines of communication are open, a customer
is more likely to be supportive of an idea or concept that might be difficult to embrace.
of a natural or human-caused disaster. An effective design should include a disaster recovery
plan that covers both the hardware and software required to run critical business applications.
To design successfully, first assess the mission-critical business processes and associated
applications. The following sections discuss issues related to disaster recovery.
issue of availability must be measured against the issue of cost. If you could make a network
completely fault-tolerant, this could be done only at a cost that most businesses would consider