Lecture 2: The network design methodology

"Planning for Information Network"
Lecture 2: The network design methodology

Contents:
•The PPDIOO network lifecycle.
•Benefits of the lifecycle approach to network design.
•Design methodology.
•The Top-Down approach to network design.

The PPDIOO network lifecycle:
•PPDIO is methodology that derived from the Cisco Prepare, Plan, Design, Implement, Operate, and Optimize (PPDIOO) methodology.
•It reflects a network’s lifecycle.

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.

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.
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 output of this phase is a set of network requirements