Data communication

Hi!
This PowerPoint is prepared to equip you
with knowledge about
DATA COMMUNICATION
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LEARNING OBJECTIVES
At the end of the lesson you should be able to :
 Define the term Data Communication
Define internet
Define computer network
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LEARNING OBJECTIVES
State reasons for computer network
List types of computer network
Draw the different types of computer network topology
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INTRODUCTION
Communication happens on a daily basis. We communicate though various
types of media transferring data from Point A to point B. In this modern world
communication is important in all field of work. People needs to communicate
on a daily basis whether doing a project at work, finishing an assignment at
school or relaxing at home. Communication makes life easier and as time goes
by the level of communication increase as technology improves.
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SO WHAT IS DATA COMMUNCATION?
Data Communication is the transmission of electronic data from one
computer to the next computer through a communication medium. The
data transferred is conducted between a source and a receiver.
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DATA
COMMUNICATION
CIRCLE
TRANSMISSION LINE CARRYING
DATA FROM ONE CIRCLETOTHE
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PEOPLE
COMMUNICATING
WITHINTHE CIRCLES
THIS DIAGRAM IS SHOWING THE
RELATIONSHIP BETWEEN PEOPLE
AND DATA COMMUNCATION.
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This is a video explaining the
Evolution of Communication
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THE INTERNET
What is it though?
In its simplest definition, the internet is a type of network and is also
the largest networks that has being created that allow millions of user
to communicate with each other. It is also use for various and
convenient reasons such as entertainment, researching information and
doing business transaction. NEXT

People uses the internet for various reasons
such as:
Sending or reading email
Educational purpose
Use a search engine
Get news online
Buy a product online
Social network sites NEXT

These are some common websites that people
visit on a daily basis by means of the internet:
You can click on the images to view their website.
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BRAIN
TEASER
TIME!!
PRESSTO CONTINUE

INSTRUCTIONS
This Exercise will test you on your
knowledge about internet and websites.
Click on the answer which correspond
best with the question above.
PRESSTO START

Question 1.
Which of the website allows you to check your
e-mails?
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Question 2.
Which of the website allows you to chat and share
information to friends online?
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Question 3.
Which of the website is used for online shopping?
Twitter
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Question 4.
Which of the website is use to search for information
and other websites?
END

CORRECT!
GOTO QUESTION: 1 2 3 4 ENDTEASER

COMPUTER NETWORKS
A computer network or data network is a telecommunication
network that allows computers to exchange data. In
computer networks, networked computing devices
(network nodes) pass data to each other along data
connections. The best-known computer network is
the Internet. NEXT

TRANSMISSION MEDIA
The Transmission Media Deals with the physical
aspect of the equipment that is used to Transmit the
data from one node to another node. These types of
transmission comes in two categories; the wired
connection and the wireless connection.
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WIRED CONNECTION
Wired Connections are established by cables
connecting form one point to the next. These are
the following Medium that are used;
Twisted Pair
Coaxial Cable
Fiber Optics Cable
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TWISTED PAIR CABLE
Twisted pair Cable is the most widely used medium for a
all telecommunication.
It consist of copper wires that is twisted in pairs
The transmission speed ranges from 2 million bit per
second to 10 million bits per second
Twisted pair comes in Unshielded Twisted pair and Shield
Twisted pair.
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COAXIAL CABLE
Coaxial cable is widely used for cable television
systems, office buildings, and other work-sites for
local area networks.
Coaxial consist of copper or aluminum surrounded by
an insulated layer.
Transmission speed ranges from 200 million bits per
second to more than 500 million bits per second.
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FIBER OPTICS CABLE
Fiber optics cable is a glass fiber that uses pulses of
light to transmit data.
Less transmission loss when using the Fiber optics
Fiber optics transmission speeds goes up to trillions
of bits per second.
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Why is Computer Networking important?
In our modern world, computer networks are important and
essential to provide convenient communication through
individuals, companies and other institute. Computer networks
connects all our nodes(computers, printers etc.) so they can
easily communicate with each other from wide or narrow
distances.
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Herearesomereasonsforcomputernetworking:
Share files with other users within a home, company or
acrosstheworld.
Getaccesstotheinternetforpersonalorbusinessusage.
To share resources such as printers, fax machines and
applications.
Toplaygamesandsocializewithotherindividual. NEXT

TYPES OF COMPUTER NETWORKS
There are different types of computer networks. Some
of the common ones includes:
Local Area Network (LAN)
Wide Area Network (WAN)
Wireless Local Area Network (WLAN)
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LOCAL AREA NETWORK
These types of computer networks connect network devices
over a relatively short distance. Some characteristics are:
Limited to a single building or site
High bandwidth
The Network is owned by a organization or company
Data and hardware sharing amongst user NEXT

WIDE AREA NETWORK
WAN spans over a large physical distance. It may be regarded as a
collection of LANs dispersed over a geographical area. The
Characteristics are:
Spread over a wide geographical area.
Large number of computer and multiple host.
Sophisticated support devices like router and gateways for
interconnecting various segment. NEXT

WIRELESS LOCAL AREA NETWORK
These types of computer networks refer to LANs that are based
onWi-Fi wireless network technology Some Characteristics are:
Links two or more devices using wireless distribution method
Uses microwave technology
This gives users the mobility to move around and still be
connected to the network. NEXT

NETWORKTOPOLOGIES
The topology of a network is its physical layout.This is how
the computers or terminals are linked together to form the
networks.Three basic network topologies are:
Star
Ring
Bus NEXT

STARTOPOLOGY
The star pattern connects everything to one host(hub),which
is the computer that handles the network’s tasks.
Hub
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RINGTOPOLOGY
The ring pattern connects the computer and other devices
all together without the use of a central hub.
Communication flows in one direction around the ring.
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BUSTOPOLOGY
The bus pattern connects the computer to the same
communication line. Communication flows in both directions
along the lines.
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INSTRUCTIONS
This Exercise will test you on your
knowledge about computer networks and
topologies. Click on the answer which
correspond best with the question above.
PRESSTO START

Question 1.
Which one of the connection media cable consist of copper
wires that is twisted in pairs?
a. Coaxial cable
b. Fiber Optics Cable
c. Twisted Pair
d. Electrical Cable
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Question 2.
Which one of the connection media cable transmit speed from
200 million bits per second to more than 500 million bits per
second.
a. Electrical cable
b. Coaxial Cable
c. Fiber optics cable
d. Twisted pair cable
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Question 4.
Fiber optics Cable consist of?
a. Copper wires
b. Aluminum Strip
c. Glass Fiber
d. Zinc Copper
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Question 3.
Which of the computer networks are limited to a single
building and its normally owned by and organization or
company ?
a. Wide Area Network
b. Local Area Network
c. Wireless Local Area Network
d. Campus Area network
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Question 5.
Which of the Computer networks Uses Microwave
technology?
a. Wide Area Network
b. Wireless Local Area Network
c. Campus Area Network
d. Local Area Network
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Question 6.
A network in which the central computer is a host to a cluster
of other computers that in turn are hosts is called a(n):
a. Star Network
b. Bus Network
c. Ring Network
d. Hierarchical Network
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Question 7.
A network configuration in which data communication from
the computers are flowed in one direction is called a(n):
a. Bus Network
b. Ring Network
c. Star Network
d. Hierarchical Network
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Question 8.
Which network topology connect all computers and devices
without a hub?
a. Star Network
b. Ring Network
c. Bus Network
d. Hierarchal Network
END

CORRECT!
GOTO QUESTION: 1 2 3 4 ENDTEASER5 6 7 8

Activities
1. Using Microsoft Paint, draw a representation of each
networkTopologies;
Ring Network
Star Network
Bus Network
2. In your own expression, explain why is it necessary to have
a computer network in this modern time.Your answer should
be emailed to m.newell449@gmail.com or sent from your
Facebook page to marlon.newell1@facebook.com.

Data communication

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