© 2003 Prentice Hall, Inc.C-1 Appendix C Computer Networking Information Systems Today Leonard Jessup and Joseph Valacich

© 2003 Prentice Hall, Inc.C-2 Appendix C Objectives Understand networking fundamentals Understand networking fundamentals Understand network services and transmission media Understand network services and transmission media Understand network software and hardware Understand network software and hardware

© 2003 Prentice Hall, Inc.C-3 Networking Fundamentals Network consists of: Network consists of:  Servers – provides services  Clients – requests services  Peers – both requests and provides services Types of networks Types of networks  Server-centric networks  Peer-to-peer networks

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© 2003 Prentice Hall, Inc.C-5 Networking Fundamentals Network Services Network Services  File services  Print services  Message services  Applications services

© 2003 Prentice Hall, Inc.C-6 Networking Fundamentals Network Operating System (NOS) Network Operating System (NOS)  Two parts:  System software that runs on the server  Client software on each workstation  Examples  Banyan Vines  Novell NetWare  Microsoft LAN Manager  LANtastic

© 2003 Prentice Hall, Inc.C-7 Networking Fundamentals Transmission Media Transmission Media  The pathway to send data and information between two or more entities on a network  Bandwidth – transmission capacity  Attenuation – weakening of a signal over distance  EMI – electromagnetic interference

© 2003 Prentice Hall, Inc.C-8 Networking Fundamentals Cable Media Cable Media  Twisted pair cable  Coaxial cable (“coax”)  Fiber-optic cable

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© 2003 Prentice Hall, Inc.C-12 Networking Fundamentals Wireless Media Wireless Media  Infrared line of sight  High-frequency radio  Pager – one way wireless  Cellular phone – two way wireless  Wireless LANs  Microwave  Terrestrial  Satellite

© 2003 Prentice Hall, Inc.C-13 Network Software and Hardware Media access control Media access control  Rules that govern how a workstation gains access to the network  Distributed access control Token passingToken passing  Random access control “Listens” for network traffic“Listens” for network traffic

© 2003 Prentice Hall, Inc.C-14 Network Software and Hardware Network topologies Network topologies  Star network  Ring network  Bus network

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© 2003 Prentice Hall, Inc.C-18 Network Software and Hardware Protocols Protocols  OSI model – open systems interconnection  Ethernet  TCP/IP

© 2003 Prentice Hall, Inc.C-19 Network Software and Hardware Connectivity hardware Connectivity hardware 1.Transmission Media Connectors 2.Network interface card (NIC) 3.Modems 4.Repeaters 5.Hubs 6.Bridges 7.Multiplexers 8.Routers 9.Brouters 10.Channel service units 11.Gateway

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