Transcript Basic Networking

Systems Analysis and Design
for the Small Enterprise
Chapter 13
Networking
Chapter Objectives
When you complete this chapter you will be able to:
• Describe the key hardware issues relating to the
system under development
• Describe the key software issues relating to the
system under development
• Install an information system that complies with the
computer’s hardware and system software
environment
• Describe how networking technology influences
small-enterprise information systems
• Describe how Internet and intranet technologies
influence small-enterprise information systems
The PC Solution
Inherent in the small-enterprise project is the
assumption that a desktop computer could function
as the hardware platform for the information system.
This assumption includes the possibility, perhaps
inevitability, that the system will include several
desktop computers networked together.
Regardless of the number of computers employed in
the system, there are several fundamental desktoprelated issues the analyst must consider.
Figure 13-1: Evolution of the PC Microprocessor
Figure 13-2: PC Hardware Diagram
Figure 13-3: Critical Hardware Performance Issues
and Acronyms
Figure 13-4: PC Operating System Diagram
Figure 13-5: Critical System Software Issues
Figure 13-6: System Environment
Users
Information
Systems
4GL
Products
System
Software
System
Hardware
Networking Solutions
Networking is fast becoming the accepted baseline
standard for information systems of all sizes.
The small enterprise can begin with a simple modem
connection to the Internet and a peer-to-peer network,
and then progress to a local or even wide area network.
The analyst working on a small-enterprise’s first-time
information system should be alert to the future
networking requirements of the enterprise, even if the
present design does not include a network.
Figure 13-10: Network Diagram
Figure 13-11: Wireless LAN Diagram
Figure 13-12: File Server Diagram
Figure 13-13: Database Server Diagram
Figure 13-14: Network Productivity Products
Internet, Intranet, and Extranet Solutions
Peer-to-peer and local area networks are confined to
relatively small geographic areas. Internet, intranet,
and extranet provide the potential for limitless
extension of the enterprise network.
Until fairly recently, these networking extensions
merely provided a transporting medium for
information products. Now there are powerful tools
and languages that permit the analyst to distribute
both data and computer processing to multiple
network resources (e.g., clients, database servers),
thus relieving the server’s processor of workload and
reducing the volume of data transmission traffic on
the network.
Figure 13-18: Extranet Diagram
Figure 13-19: Data-Driven Web Page Scenario
Figure 13-20: Client/Server Database Model
N-tier Service Architecture
Figure 13-21: Web-Accessible Database Options
Chapter Summary
•The analyst must address diverse hardware and
software issues:
•Hardware:
speed
memory
storage
•Software:
user interfacing
resource management
resource sharing
•Networking hardware and software decisions
complicate this process.