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Design , implementation and management of secured lan

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par Eliud Ir. Eliud Aganze
Jomokenyatta university of agriculture and technology - information technology 2014

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1.6. 2.5.2 Top-Down Network Design Methodology

Top-down network design is a methodology for designing networks that begins at the upper layers of the OSI reference model before moving to the lower layers. It focuses on applications, sessions, and data transport before the selection of routers, switches, and media that operate at the lower layers. The top-down network design process includes exploring divisional and group structures to find the people for whom the network will provide services and from whom you should get valuable information to make the design succeed.

1.7. 2.5.3 Plan, Design, Implement, Operate, and Optimize (PPDIOO) methodology

The network design methodology presented in this section is derived from the Cisco Prepare, Plan,

Design, Implement, Operate, and Optimize (PPDIOO) methodology, which reflects a network's lifecycle. The following sections describe the PPDIOO phases and their relation to the network design methodology, and the benefits of the lifecycle approach to network design. Subsequent sections explain the design methodology in detail.

Figure 2.3. PPDIOO Network Lifecycle Influences Design

The following describes each PPDIOO phase:

Prepare phase: The Prepare phase involves establishing the organizational (business) requirements, developing a network strategy, and proposing a high-level conceptual architecture, identifying technologies that can best support the architecture. Financial justification for the network strategy is established by assessing the business case for the proposed architecture.

Plan phase: This phase involves identifying the network requirements, which are based on

the goals for the network, where the network will be installed, who will require which network services, and so forth. The Plan phase also involves assessing the sites where the network will be installed and any existing networks, and performing a gap analysis to determine if the existing system infrastructure, sites, and operational environment can support the proposed system. A project plan helps manage the tasks, responsibilities, critical milestones, and resources required to implement the changes to the network. The project plan should align with the scope, cost, and resource parameters established in the original business requirements. The output of this phase is a set of network requirements.

Design phase: The initial requirements determined in the Plan phase drive the network design specialists' activities. These specialists design the network according to those initial requirements, incorporating any additional data gathered during network analysis and network audit (when upgrading an existing network) and through discussion with managers and network users. The network design specification that is produced is a comprehensive detailed design that meets current business and technical requirements and incorporatesspecifications to support availability, reliability, security, scalability, and performance. This design specification provides the basis for the implementation activities.

Implement phase: Implementation and verification begins after the design has been approved. The network and any additional components are built according to the design specifications, with the goal of integrating devices without disrupting the existing network or creating points of vulnerability.

Operate phase: Operation is the final test of the design's appropriateness. The Operate phase involves maintaining network health through day-to-day operations, which might include maintaining high availability and reducing expenses. The fault detection and correction and performance monitoring that occur in daily operations provide initial data for the network lifecycle's Optimize phase.

Optimize phase: The Optimize phase is based on proactive network management, the goal of which is to identify and resolve issues before real problems arise and the organization is affected. Reactive fault detection and correction (troubleshooting) are necessary when proactive management cannot predict and mitigate the failures. In the PPDIOO process, the

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