Multi-media Computers
and Computer Networks
Questions ?
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Media is used for …………………
Multimedia computer is capable of integrating
…………………………………..
OCR stands for …………………………….
Images are composed of a collection of ……..
Pixel components are -----, ----- and -----.
Media
A medium is something, which can be used for
presentation of information.
Two ways to present information:
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Unimedia presentation
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Multimedia presentation
Multimedia
presentation
greatly
comprehension capability of users.
enhances
the
Presentation of Information
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Multimedia Computer System
System which is capable of integrating two or
more types of media for the purpose of
generation, storage, representation,
manipulation and access of multimedia
information.
Media can be: text, graphics, images,
animation, audio and video.
Multimedia Components
Multimedia Components
Multimedia Components
Multimedia Components
Multimedia Components
Multimedia Components
Multimedia Computer System Hardware Requirements
Monitor
(output)
Speaker
(output)
System unit
(processor, memory…)
Printer
(output)
Storage devices
(CD-RW, Floppy,
Hard disk, zip,…)
Scanner
(input)
Mouse
(input)
Keyboard
(input)
Multimedia Applications
Answers
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Media is used for presenting information.
Multimedia computer is capable of integrating
two or more types of media.
OCR stands for Optical Character Recognizer.
Images are composed of a collection of pixels.
Pixel components are
R-Red,
G-Green and
B-Blue.
Questions ?
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Computer Network is an interconnection of
………………………………..
LAN stands for ………………………..
MAN stands for ……………………….
WAN stands for ………………………..
NIC stands for ………………………
Types of n/w
………….
………….
Introduction to Computer Networks
Computer Networks
Computer network
connects two or more
autonomous
computers.
The computers can be
geographically located
anywhere.
Introduction to Computer Networks
Uses of Computer Networks
Resource Sharing
Hardware (computing resources, disks, printers)
Software (application software)
Information Sharing
Easy accessibility from anywhere (files, databases)
Search Capability (WWW)
Communication
Email
Message broadcast
Remote computing
Distributed processing (GRID Computing)
Introduction to Computer Networks
LAN
Network in small geographical Area
(Room, Building or a Campus) is called LAN

LAN- Local Area Network

used by schools and businesses

used to connect around 10-500 computers
in a building
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only accessible from within the building
MAN&WAN
Network in a City is called MAN
(Metropolitan Area Network)
Network spread geographically (Country or
across Globe) is called WAN
(Wide Area Network)
Introduction to Computer Networks
Network Concepts
• Network Hardware
– Servers- powerful computers dedicated
to controlling all of the systems on the
network. All networked computers are
connected to the server in some way
– Printers- One of the reasons networks
were developed was to make a single
printer accessible by many different
computers
– Computers- individual machines that
are connected to the server
– Network Interface Card (NIC)- a device
that is installed into a computer to give
it a terminal that can run a cable to
access the network
Introduction to Computer Networks
Network Software
• Network Operating System
– the system software run on the server
– An operating system (OS) is software that
computers use to run the environment that
allows you to access applications and create
files. Without an OS, a computer is useless.
• Networked Applications
– computer programs located on the network that
are accessed by individual computers
– This makes loading software on individual
computers unnecessary.
OS Logos
Computer Networks
Data Transmission Media
Data Transmission Media
Data Transmission Media
Data Transmission Media
Data Transmission Media
Data Transmission
Data Transmission
Data Transmission
Data Transmission
Introduction to Computer Networks
Network Topology
The network topology
defines the way in which
computers, printers, and
other devices are
connected. A network
topology describes the
layout of the wire and
devices as well as the
paths used by data
transmissions.
Introduction to Computer Networks
Bus Topology
Commonly referred to
as a linear bus, all the
devices
on
a
bus
topology are connected
by one single cable.
Star & Tree Topology
The star topology is the most
commonly used architecture in
Ethernet LANs.
When
installed,
the
star
topology resembles spokes in a
bicycle wheel.
Larger
networks
use
the
extended star topology also
called tree topology. When used
with network devices that filter
frames or packets, like bridges,
switches, and routers, this
topology significantly reduces
the traffic on the wires by
sending packets only to the
wires of the destination host.
Introduction to Computer Networks
Ring Topology
A frame travels around the ring,
stopping at each node. If a node
wants to transmit data, it adds the
data as well as the destination
address to the frame.
The frame then continues around
the ring until it finds the destination
node, which takes the data out of the
frame.
Single ring – All the devices on
the network share a single cable
Dual ring – The dual ring topology
allows data to be sent in both
directions.
Introduction to Computer Networks
Mesh Topology
The mesh topology
connects all devices
(nodes) to each other
for redundancy and
fault tolerance.
It is used in WANs to
interconnect LANs and
for
mission
critical
networks like those
used by banks and
financial institutions.
Implementing the mesh
topology is expensive
and difficult.
Introduction to Computer Networks
Network Components
Physical Media
Interconnecting Devices
Computers
Networking Software
Applications
Network Types
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Two major types of networks
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Peer-to-peer
Client/Server (also called server-based)
Peer-to-Peer Network
Guide to Networking Essentials, Fourth Edition
39
Peer-to-Peer Networking
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Peers with no centralized control over shared resources
Can share resources with any other computer on
network
No computer has higher access priority
No computer has more responsibility to provide or
shared resources
Figure shows typical peer-to-peer network
Guide to Networking Essentials, Fourth Edition
40
Peer-to-Peer Networking Advantages
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Easy to install and configure
No dedicated server
Users control own shared resources
Inexpensive to purchase and operate
No additional equipment or software
No dedicated administrators
Works best with 10 or fewer users
Guide to Networking Essentials, Fourth Edition
41
Server-Based Networks
Guide to Networking Essentials, Fourth Edition
42
Server-Based Networks
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Server responds to client requests
Provide centralized control over resources
Servers require faster CPUs, more memory,
larger disk drives, and extra peripherals such
as tape drives
May be dedicated, handling only requests
from client communities
One or more servers may do centralized
verification of user accounts and passwords
Guide to Networking Essentials, Fourth Edition
43
Answers
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Computer Network is an interconnection of
two or more autonomous computers.
LAN Local Area Network.
MAN Metropolitan Area Network.
WAN Wide Area Network.
NIC Network Interfacing Card.
Types of n/w
Peer-to-Peer Network.
Client-Server model network.
Thank You
Murugan R
Asst. Professor
Dept. of Computer Applications
MES College Marampally
Aluva – 683 107
www.LSP4YOU.COM
+919447177829
murugan@mesmarampally.org
mes.murugan@gmail.com