Tài liệu Chapter 3: Network Computer ATHENA doc

ATHENA
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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• A group of computers and other
devices connected together is
called a network
• Networking is the concept of
sharing resources and services
What is a Network?
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Figure 1-1 What is a Local Area Network?
Example a Network
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• To avoid duplication of equipment and
resources
• Be cost effective
• To communicate efficiently
• To improve management
Why we use a Network?
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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 auto-recognition and auto-configuration
is called plug-and-play compatibility
• With plus-and-play, 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 e-mail to communicate
and LANs can make that process
faster and easier.
• Many LAN support voice-mail, video
conferencing, and distance learning
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LAN Support New Applications
~Support New Applications
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Network Models
Network categories
–Server-Based network
–Peer-to-Peer network
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Server-Based Network
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Server-Based Network
~A server-based network consist of a
group of user-oriented PCs (call

clients) that issue requests to a server
~Specialized Servers: File server, print
Server, Database Servers
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Server-Based Network
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Peer-to-Peer Network
~ A peer-to-peer 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 -to-Peer Network
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Peer-to-Peer Network
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Peer-to-peer Network
• Where Peer-to-Peer 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 peer-to-peer 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