Chapter 3: Network Computer
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Objective
What is a Network? Why we use a Network? Advantages of LAN Types of Network
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What is a Network?
•A group of computers and other devices connected together is called a network
•Networking is the concept of sharing resources and services
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Example a Network
Figure 1-1 What is a Local Area Network?
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Why we use a Network?
• To avoid duplication of equipment and
resources
• Be cost effective • To communicate efficiently • To improve management
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LAN Overview
A Local Area Network (LAN) is a group of computers and network communication devices interconnected within a geographically limited area.
LAN provide companies with time
and money saving
LAN is simple, inexpensive,
support many type of protocols
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Setup a Local Area Network
Simple Connections
• Installing an adapter card to connect computer on
a LAN was a complicated process.
• The software accompanying a LAN adapter is
automatically configured to allow the computer to begin communicating immediately
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Setup a Local Area Network
Simple Connections
• This autorecognition and autoconfiguration is
called plugandplay compatibility
• With plusandplay, the software will ask some questions so that it can define the parameters required to get your PC communicating with other PCs on the network.
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Setup a Local Area Network
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LAN Supports Multiple Protocols
Supports Multiple Protocols
• A protocol is method or procedure used for the
exchange of information between two communications devices • Most important protocol
– Novell Netware – AppleTalk – TCP/IP – OSI protocol
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LAN Support New Applications
Support New Applications
• We all use email to communicate and LANs can make that process faster and easier.
• Many LAN support voicemail, video conferencing, and distance learning
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LAN Support New Applications
Support New Applications
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Network Models
Network categories – ServerBased network – PeertoPeer network
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ServerBased Network
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ServerBased Network
A serverbased network consist of a group of useroriented PCs (call clients) that issue requests to a server Specialized Servers: File server, print Server, Database Servers
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ServerBased Network
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PeertoPeer Network
A peertopeer network consist of a group of PCs that operate as equal Each PC is called a peer and act as a
client or server
User of each computer determines what
is shared
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Peer toPeer Network
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PeertoPeer Network
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Peertopeer Network
• Where PeertoPeer is appropriate?
– Fewer than 10 users – Security is no need – User located in same general area – Organization will have limited growth in
the future
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Combination Networks
Include peertopeer and server based
networking
Server based operating system is responsible for sharing the major applications and data Clients can run Win NT workstation, Win 95, Win 98, Win Me, Win XP... They can access resources on server and share their resources
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Networks Classification
LAN: Local Area Network WAN: Wide Area Network MAN: Metropolitan Area Network GAN: Global Area Network
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Networks Classification (2)
Local Area Network
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Networks Classification (3)
Wide Area Network
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Summary
• Network overview • Types of network • LAN overview • Some advantages of LAN
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