CS457/557/MIS420/520 - Computer Networks: Chapter 12 - The Network Development Life Cycle

Objectives

Understand how the network development life cycle relates to other system development architectures and life cycles.
Understand the network development life cycle
Understand what automated tools are available to assist in the network development life cycle process, their costs and their shortcomings.
Understand the role of vendors at various stages of the network development life cycle.

Introduction

An Emphasis on the Practical

Where does Network Design fit in the Overall Scheme of Things?

The top-down model and the network development life cycle
Top-Down Model	Information Systems Development Process
Business	Strategic business planning Business processing re engineering
Applications	Systems development life cycle Systems analysis and design Application development life cycle
Data	Database analysis and design Database distribution analysis
Network	Network Development Life Cycle Network analysis and design
Technology	Physical network design Network implementation Technology analysis

Understanding Systems Development: Process and Product

process - activities that should be taking place at any point during the development cycle
product - outcome / deliverable from a particular stage of the overall cycle
milestone - indicates completion of one stage of the development cycle

The Network Development Life Cycle

Analysis
Design
Simulation / prototyping
Implementation
Monitoring
Management

Network Analysis and Design Methodology

Network analysis and design methodology summary

Problem definition and feasibility study

Strategic information system design; develop request for proposal(RFP)

Develop RFP

Evaluate RFPs and vendor demonstration

Make or buy decision

Out-sourcing

Inhouse development

Final proposal

Approval and implementation

Monitoring and management

Critical success factors of the network development life cycle
Success Factor	Explanation
Identification of all potential customers and constituencies	No one likes to feel left out or that their input does not matter.
Political awareness	Awareness of the corporate political environment as well as the overall corporate culture can have a large impact on a project's success
Buy-in	As each stage is concluded, buy-in or agreement as to conclusions from all affected customer groups is of critical importance
Communications	Do not assume others know what is going on with the project. Write memos, newsletters, send E-mail, or communicate with key people in person
Detailed project documentation	Document every phone call and every meeting. Keep the project well organized from day one with copies of all correspondence
Process/product awareness	Keep in mind what is the process and product for each step in the network analysis and design methodology
Be honest with yourself	Identify weak points in your proposal and address them accordingly. Play "devil's advocate" with your proposal and prepare for possible objections

Start with a Clearly Defined Problem
Understand Strategic Business Objectives
Importance of Baseline Data (current status)
Top-down model organizes baseline data (requirements gathering)
Feasibility Studies and Buy-in
Strategic Information Systems Design (establish evaluation criteria)

Strategic Information System Design Fosters Business Process Re engineering

Identify Overall System Characteristics
Identify Major Business Functional Areas
Identify Business Processes Associated with each Business Functional Area
Identify Decision Points and Opportunities for Improvement
Develop Specific Evaluation Criteria
Assign Priorities to the Major Functional Areas

items are so important that the system is simply not worth implementing without them
items can be done without or "worked around," but need to be implemented ASAP
items would be nice to have, but can be done without

Produce the RFP
Examine Each Corporate Location

People
Hardware-Software-Media
Data
Physical Plant

Prepare the Final RFP
Information Supplied to Vendors

Company Profile
Statement of the Problem
Overall System Characteristics
Project Phase Prioritization
Proposed Project Schedule Summary

Information Requested from Vendors

Systems Development (experience?)
Hardware, Operating Systems, Software (what is used?)
References
Pricing (Hardware, Software)
Training
Support
Vendor Background

Percent of Fit Goal
Proposal Evaluation and the Make or Buy Decision
Network Analysis and Design (WAN)

In-House Network Analysis and Design (LAN)

Data Traffic Analysis

Data traffic analysis
Data Traffic Analysis Type	Data Traffic Analysis Description
Payload Type Analysis	Most locations will require at least voice an data. Video conferencing and multimedia may need to be supported.
Transaction analysis	Use process flow / document flow analysis to identify each type of transaction
Time Studies	Analyze when and how often each transaction type occurs
Traffic Volume Analysis	used to map bandwidth requirements
Mission-critical analysis	may dictate need for special data security procedures
Protocol stack analysis	look at alternatives

Circuit Analysis and Configuration Alternatives
Consideration of Network Alternatives
Network Hardware Analysis and Configuration Alternatives
Use of the IPO Model
Effect of Business Issues on Network Design
Review of Overall Network Analysis and Design Process
Preparing the Final Proposal
Preparing a Comprehensive Budget

Comprehensive systems and networking budget model

Acquisition

Operation

Incremental Change/Anticipated Growth

Total:

Hardware

DataCenter:

NetworkOperations:

ApplicationsDevelopment:

Software

DataCenter:

NetworkOperations:

ApplicationsDevelopment:

Personnel

DataCenter:

NetworkOperations:

ApplicationsDevelopment:

Communications

DataCenter:

NetworkOperations:

ApplicationsDevelopment:

Facilities

DataCenter:

NetworkOperations:

ApplicationsDevelopment:

Totals

Anticipating Network Growth
Implementation Process: pilot test
Project Management

Automating the Network Development Life Cycle

CASE - computer assisted software engineering

CANE - computer assisted network engineering

Automating the network development life cycle
	Analysis \| Design	Simulation (performance modeling software)	Monitoring	Management
Examples	SYNERGIS NEUSTAR	COMDISCO BONES MAKE Systems NETMAKER CACI Products COMNET III INTERNETIX LANSIM	Monitoring Software Frontier Software NETSCOUT ProTools Foundation Manager Concord Communications TRACKER Protocol Analyzers Network General Distributed Sniffer	Hewlett-Packard OPENVIEW IBM NETVIEW SUN SUNNET MANAGER

The Future of the Automated Network Development Life Cycle

Horizontal Integration

Vertical Integration

Slides

CS457/557/MIS420/520 - Computer Networks: Chapter 12 - The Network Development Life Cycle

Objectives

Introduction

An Emphasis on the Practical

Where does Network Design fit in the Overall Scheme of Things?

Understanding Systems Development: Process and Product

The Network Development Life Cycle

Network Analysis and Design Methodology

Strategic Information System Design Fosters Business Process Re engineering

In-House Network Analysis and Design (LAN)

Automating the Network Development Life Cycle

The Future of the Automated Network Development Life Cycle

Horizontal Integration

Vertical Integration

Activities(due Nov. 24): 1