Cisco Architectures for the Enterprise
Business forces affecting decisions for the enterprise network include the following:
- Return on investment
- Regulation
- Competitiveness
- Removal of borders
- Virtualization
- Growth of applications
PPDIOO Phase Description
Prepare - Establishes organization and business requirements, develops a network strategy, and proposes a high-level architecture
Plan - Identifies the network requirements by characterizing and assessing the network, performing a gap analysis
Design - Provides high availability, reliability, security, scalability, and performance
Implement Installation and configuration of new equipment
Operate - Day-to-day network operations
Optimize - Proactive network management; modifications to the design
The following sections focus on a design methodology for the first three phases of the PPDIOO methodology. This design methodology has three steps:
Step 1. Identifying customer network requirements – Talking to all the people.
Step 2. Characterizing the existing network – Collecting Network information.
Step 3. Designing the network topology and solutions
Designing the Network Topology and Solutions:
Top – down design just means starting your design from the top layer of the OSI model and working your way down. Top-down design adapts the network and physical infrastructure to the network application’s needs. With a top-down approach, network devices and technologies are not selected until the applications’ requirements are analyzed.
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