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Importance of Legacy Network Developing Design Criteria Summary

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Why is it important to actively consider the legacy network when
developing network design criteria?
Legacy network is a term used to describe a network based on older, outdated protocols. For
example, any network not based on the IP (TCP/IP) protocol - like IPX or SNA- is considered a
legacy network. Whereas network design criteria are the explicit goals that a project must achieve in
order to be successful. In recommendation and feasibility reports the design and decision criteria
determine the document's final recommendation for action. Managers use these criteria as their basic
tool in evaluating a project's potential for success and how well it fits into the goals of the
organization. Experts need explicit design and decision criteria in order to evaluate recommended
designs of devices and test procedures.
Design Network
It is not uncommon for districts to be challenged by the scale and scope of the infrastructure
required to support their performance and management requirements. Before beginning network
design, districts should consider strategies for mitigating those requirements:
Consider increasing last-mile access bandwidth by implementing caching technologies
rather than or in addition to raw bandwidth upgrades. Although this will not change the
requirements on the building LAN or the district WAN, it can reduce the long-term
service/bandwidth cost for building access, while increasing network response time.
Depending upon the caching design, this can also reduce Internet access upgrade costs.
Take advantage of purchasing and management aggregation opportunities to reduce the cost
of hardware purchases, Internet access, and network lifetime management.

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For basic and emerging environments, district networks often have legacy systems with
comparatively low capacity and reliability. Districts that are not making the shift to digital
transformation may not need to make drastic upgrades to their networks. For those moving to
transformational environments, however, a holistic design effort that involves all stakeholders in the
discussion of requirements and that addresses all aspects of network design collectively in order to
make optimal trade-offs, will enable leaders to optimize their technology investments over time.
Holistic design is complex and requires professional expertise in network architecture and network
engineering. For most districts, aggregation strategies such as consortia or 3d party services that
provide network staff across districts is essential to obtain this level of expertise as it is expensive to
maintain the needed professionals for just one district.
In developing network design criteria it is important to actively consider the legacy network
because In order to create a frame of reference, common features used in a medium-size enterprise is
analyzed based on a work implemented in a real scenario. The network infrastructure is composed of
several data centers distributed along the country in a mesh topology. On the other hand, intra-DC
connectivity illustrated in Figure 2.1 presents the data center topology corresponding to a
hierarchical structure, with well-defined access, distribution and core switches. The network

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Why is it important to actively consider the legacy network when developing network design criteria? “Legacy network is a term used to describe a network based on older, outdated protocols. For example, any network not based on the IP (TCP/IP) protocol - like IPX or SNA- is considered a legacy network. Whereas network design criteria are the explicit goals that a project must achieve in order to be successful. In recommendation and feasibility reports the design and decision criteria determine the document's final recommendation for action. Managers use these criteria as their basic tool in evaluating a project's potential for success and how well it fits into the goals of the organization. Experts need explicit design and decision criteria in order to evaluate recommended designs of devices and test procedures.” Design Network “It is not uncommon for districts to be challenged by the scale and scope of the infrastructure required to support their performance and management requirements. Before beginning network design, districts should consider strategies for mitigating those requirements:” • “Consider increasing last-mile access bandwidth by implementing caching technologies rather than or in addition to raw bandwidth upgrades. Although this will not change the requirements on the building LAN or the district WAN, it can reduce the long-term service/bandwidth cost for building access, while increasing network response time. Depending upon the caching design, t ...
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