Chapter 5

Network Computing

Agenda

• Functions

• Feasibility

• Analysis

Network Functions

• Discovery

• Communication

• Collaboration

Discovery

• Internet, Web– Software agents, intelligent agents– Data warehouse and data mining

• Characteristics– Open– Resourceful– Efficient– Dynamic

Communication

• Internet, Intranet, Extranet

• Real-time, no distance

• Voice, data, video

Collaboration

• Groupware, Group decision support systems, (GDSS), Intranet, Extranet– Workflow systems: administrative, purchasing,

production, etc.– Screen sharing– Productivity, quality, timely

Agenda

• Functions

• Feasibility

• Analysis

Enterprise Networking Goals

• Connectivity

• Portability

• Interoperability

• Scalability

• Others?

Network Feasibility• Technology

– Hardware– Media– Software– Protocols

• Operation– Horizontal, vertical, both– Culture, level of computing (individual, dept, etc.)

• Legal– International, interstate

• Cost/benefit• Corporate objectives

Agenda

• Functions

• Feasibility

• Analysis

Network Analysis

• Open system interconnection (OSI)• Type• Topology• Architecture• Transmission characteristic• Protocol• Interface• Media

Network Analysis

• Lines

• Carrier

• Service

• Security

• Code

• Signal

Open system interconnection (OSI)

• Physical layer

• Data link layer

• Network layer

• Transport layer

• Session layer

• Presentation layer

• Application layer

Network Types

• Voice or data– Private branch exchange (PBX)– Centrex

• LAN, MAN, WAN• Enterprise

– Internet– Intranet– Extranet

• Public, private

Network Types

• Valued added– Packet switching– Frame relay– Asynchronous transfer mode (ATM)– Integrated services digital network (ISDN)– Digital subscriber line (DSL)– Fiber distributed data interface

• Virtual private network (VPN)• Backbone

Network Types

• Wireless– Cellular radio technology– Mobile computing– Personal communication system– Personal digital assistance

Network Topologies

• Token ring

• Bus

• Star

• Hierarchical

• Web

• Hybrid

Network Architecture

• Client/server

• Peer-to-peer

Transmission characteristics

• Speed– Bits per second (bps)– Baud rate (Hertz)

• Direction– Simplex– Half-duplex– Full-duplex

• Mode– Asynchronous– Synchronous

• Accuracy– Horizontal– Vertical– Cyclic redundancy checking

Protocols

• Definition– Rules & procedures for transmission

• Protocol types– Token passing

– Carrier sense multiple access/collision detection

– Transmission control protocol/internet protocol (TCP/IP)

– Telnet

– HTTP

Interface

• Transmission interfaces– Parallel data transfer

– Serial data transfer

– Universal asynchronous receiver/transmitter

• Network interfaces– Interface card

– Routers

– Bridges

– Gateways

Interface

• Modem

• Multiplexer– Frequency division, time division, statistical

time division, wavelength division

• Front-end processor

• Concentrator

Network Media

• Cable media– Fiber optics– Coaxial cable– Twisted-pair wire– Shield twisted-pair wire

• Wireless– Microwave– Radio– Infrared– Satellite

Network Lines

• T1, T2, T3, T4, T5

• ISDN

• DSL

• Wireless

Network Carriers

• International

• Long distance

• Local

• Wireless

• Internet service provider

Network Services

• Types– In-house– Outsource

• Services– Data– Voice– Video– Wireless

Security

• Transmission– Hardware– Software

• Personnel

• Procedure

• Inventory

• Physical & Logical

Others• Codes

– ASCII– EBCDIC– Unicode

• Error corrections– ACK: acknowledge– NAK: negative acknowledge

• Impact– Health, job, organization, social

• Issues– Ethics, privacy, free speech, copy right, management

Points to Remember

• Functions

• Feasibility

• Analysis

Discussion Questions

• Why does an organization need a reliable network?

• What are the general selection criteria for a network?

• What kind networks are useful to an university such as CSUS?

• What kind networks are needed by a company such as Intel?

Discussion Questions

• Design a network system for a university in terms of the following items:– Types– Topologies– Media– Lines– Carrier– Services– Security– Health– Privacy

Assignment

• Review chapter technology guides 1-2 & chapters 1- 5

• Read chapter technology guide 4

• Group assignment 1 due date: 10/2/01

• Research paper