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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