Transcript Chapter_05

Chapter No: 05
Chapter No: 05
Course Title:
IT IN BUSINESS
Course Instructor:
ADEEL ANJUM
BY ADEEL ANJUM (MCS, CCNA,WEB DEVELOPER)
1
Course Contents
Chapter No
1.
2.
Chapter Name
INTRODUCTION
INPUT & OUT PUT DEVICES
Page No
01
251
3.
SOFTWARE
117
4.
HARDWARE
117
5.
COMMUNICATIONS & NETWORKS
309
6.
INTERNET
49
BY ADEEL ANJUM (MCS, CCNA,WEB DEVELOPER)
2
DATA COMMUNICATION
• Communication is process of
transferring messages from one device
to another device. There are three
elements of data communication.
• Sender
• Receiver
• medium
diagram
LINK
SENDER
RECIEVER
NETWORK
• Connectivity of two or more than two
devices so that they can communicate.
connectivity is done through hardware
and communication is done through
software. so network is combination of
both hardware and software.
NETWORKS
ADVANTAGES OF NETWORK
•
2.
3.
4.
Sharing of peripheral devices:
Sharing of data:
Better communication:
Access to database:
Types Of Network
Network is divided into three main types
•
•
•
LAN (Local area network)
MAN (Metropolitan area network)
WAN (wide area network)
• LAN
• LAN range is usually within a mile one office
,one building or within in campus of
university.
• MAN
MAN is a network within a city. or network
between cities.
• WAN
WAN stand for wide area network. It is
communication that covers a wide area such
as a country .internet is the example of WAN.
TOPOLOGY
TOPOLOGY
MESH
STAR
BUS
RING
TOPOLOGIES
•
1.
2.
3.
4.
The logical layout ,or shape of
network is called topology. The basic
topologies are.
Star
Ring
Bus
Mesh
1.STAR TOPOLOGY
In star topology network all computers and
other devices are connected to a central
server in star topology HUB is used.
The advantage of this topology is if
connection is broken between any
communication device and the HUB, the rest
of the devices on the network will work. it is
easy to install and reconfigure.
STAR TOPOLOGY
2.BUS TOPOLOGY
In a bus topology all devices are
connected to a single wire. There is no
central server.
The advantage of a bus network is easy
to install. it use less cabling as
compared to mesh and star topology.
Disadvantage is that if a connection is
broken the entire network may stop
working
BUS TOPOLOGY
INTER NETWORK
Token
Ring
Private Nets
3.RING TOPOLOGY
A ring topology is one in which all
computers are connected in a
continuous loop. The message flow in
one direction. If a connection is broken
the entire network will stop working.
RINGTOPOLOGY
4.MESH TOPOLOGY
In mesh topology every device has a
dedicate link to every other device.
dedicated mean that link carries traffic
only between the two devices it
connect. a fully connected mesh ha
n(n-1)/2 physical links. every device ha
n-1 input output port.
Advantages and disadvantages
of mesh topology
A mesh topology is robust. if one link
become unusable it will not effect all
network.
Disadvantage is cabling and number of
input and out put ports required.
installation and reconnection is
difficult.
MESH TOPOLOGY
DATA TRANSMISSION MODES
•
There are three ways or three modes of
data transmission. These are as follow
1. SIMPLEX
2. HALF DUPLEX
3. FULL DUPLEX
1.SIMPLEX
In this mode data is transmitted
unidirectional. Data can only flow in
one direction.
For example you can listen to your
favorite radio station but you cannot
talk back.
2.HALF DUPLEX
In half duplex ,system can transmit
data in both direction at a time. Half
duplex line can alternatively send and
receive data. It requires two wires. This
is most common type of transmission
for voice communication because only
one person speak at a time. you can
either talk or listen but you cannot do
both at the same time.
3.FULL DUPLEX
with full duplex ,data can flow in both
direction at the same time. a full duplex
line is faster ,since it avoid the delay
that occurs in a half duplex .
for example client send data to central
computer at the same time central
computer sends data to client. full
duplex is also called two way
transmission.
NETWORK LINKING DEVICES
1.
2.
3.
4.
HUB
SWITCH
BRIDGE
ROUTER
1.HUB
HUB is common connection point. with
HUB Bandwidth is shared among all
comopnents.HUB is a half duplex
device, meaning it transmits data in
both direction but only in one
direction.it also broadcast data.
Hubs operate at Physical Layer
Physical
A
B
C
All devices in the same broadcast domain
Devices share the same bandwidth
D
2.SWITCH
A switch is a device which connects
computers to a network. a switch is a
full duplex device. switch is intelligent
device. First time switch also broadcast
data. After that it will unicast data.
3.ROUTER
it is an intelligent device, having
software. it unicast data. it integrate
LAN and WAN. physically it is similar to
switch. but it is much intelligent device
as compared to switch.
4.BRIDGE
A bridge is a device used to connect
the same type of network. for example
similar local area network can be joined
together to create larger area network.
Network Devices Domains
Hub
Bridge
Switch
Router
THANKS FOR PATIENCE
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