Scalability:How much growth a netwo

Scalability:How much growth a network design must support.
Availability:The amount of time a network is available to users, often expressed as a
percent uptime, or as a mean time between failure (MTBF) and mean time to repair
(MTTR). Availability documentation can also include any information gathered on
the monetary cost associated with network downtime.
Network performance:The customer’s criteria for accepting the service level of a
network, including its throughput, accuracy, efficiency, delay, delay variation (jitter),
and response time. Specific throughput requirements for internetworking devices, in
packets per second (pps), can also be stated. Specific throughput requirements for
applications should be included in the Network Applications section.
Security:General and specific goals for protecting the organization’s capability to
conduct business without interference from intruders inappropriately accessing or
damaging equipment, data, or operations. This section should also list the various
security risks that the customer identified during the requirements-analysis phase of
the design project.
Manageability:General and specific goals for performance, fault, configuration,
security, and accounting management.
Usability:The ease with which network users can access the network and its services. This section can include information on goals for simplifying user tasks related to
network addressing, naming, and resource discovery.
Adaptability:The ease with which a network design and implementation can adapt
to network faults, changing traffic patterns, additional business or technical requirements, new business practices, and other changes.
Affordability:General information on the importance of containing the costs associated with purchasing and operating network equipment and services. Specific budget
information should be included in the Project Budget section.
The Technical Goals section should also describe any tradeoffs the customer is willing to
make. For example, some customers might indicate that affordability can be sacrificed to
meet strict availability goals, or usability can be sacrificed to meet strict security goals.
As discussed in Chapter 2, including a chart that categorizes the comparative weights of
goals can help the readers of a network design document understand some of the design
choices that were made.
Chapter 14: Documenting Your Network Des