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NETWORKS Maria Beltramo & Sofia Cacici, Disadvantages - Coggle Diagram
NETWORKS
Maria Beltramo & Sofia Cacici
CONCEPTS
Advantages
communication
And efficient way for sharing things like email, messages,etc.
roaming
Users are not fixed to one place
sharing resources
easy to share resources
sharing information
share files and information, no need to fill the hard drive
sharing software
to stream software using web applications
What is it?
When two or more devices connected together for exchanging data
DEVICES/HARDWARE
hub
device
it connects computers to make a LAN
not secure
is used at the center of a star network
it haves cables plugged into it for each computer
switch
device
it connects computers to make a LAN
is at the center of a star network
more "intelligent" than a hub
only send message to an especific computer
more secure and expensive
router
device
connects togheter two or more networks
use to join a home or bussines network
it haves the internet cable plugged
bridge
network device
typically links togheter two differents parts of a LAN
modem
It enables computers to connect to internet over a telephone line
converts digital signals to analogue signals
it contains
DAC
and
ADC
DAC
converts digtal data into data that the telephone is designed to carry
ADC
it convert the data that the DAC send ,back into digital data
TYPES
LAN
It is confined to one building or site
private network
local area network
WAN
spread over a large area
created by the joining several LANs
wide area network
MAN
WLAN
a LAN that uses radios signal
more difficult to make secure
it contains a router at the center
TOPOLOGIES
BUS
is a long, central cable that connected the computers together
cheap and slow
if the central bus cable broke it would stop working
RING
a loop of cable were all the computers connects
if the cable is break the ring can still work
STAR
all computers connected to a central device
is expensive and very fast. It can cope with a broken cable
if the central device broke it would stop working
the most common topology
HYBRID
one network that combines tow or more of basic topologies
has several stars networks linked together
TYPES OF CONNECTION
clients
a computer that request data from a server
servers
computer that hold data to be share to other computers
p2p
type of network model
all computers share responsibility
no one central server
clients server
the data or web apliccation
is hosted on a server and accessed by client computer
INTERNET, INTRANET,EXTRANET
INTERNET
worldwide system of interconnected computers
wordwide
the part of the internet that is able to access with a web browser
INTRANET
only available within a particular organisation, not to the public
EXTRANET
a private network
use to allow users to exchange data and applications and share information
Disadvantages
dependence
users relying on a network can be stuck without acces to it
hacking
it is easier to gain acces for the hackers
hardware
other network hardware is required to set up a network
viruses
is it easier for the virus to get in