Dr.Dayang shows us about the idea of networking,
which is as old as telecommunication itself.
Do you realize that computer networking actually is
just like communication we do in our daily life.
We need 2 people as sender and receiver in
communication. Ofcoz there is a medium to let us communicate to each other. Computer
networking is just like changing the people to computer devices, the medium is
how the 2 computer connected to each other. Confuse to my explained isit? Alright....just
use the word from note...
computer network
Based on the note given,
Same as what I mentioned up there. (ok, the note
given are in a pretty, simple sentences)
Computer networking can be:
© computer
devices/equipments
© transmission
media(send/control data/signal)
© communication
devices(transmit/send data frm sources to destination)
© softwares
Type of network:
is
based on geografhic coverage
PAN
-
Personal Area Network
LAN
-
Local Area Network
MAN
-
Metropolitan Area Network
WAN
-
Wide Area Network
beside that, also got other network like SAN, WLAN and so on.
network components:
~Terminals & workstation ,computer
and other devices(end node)
Normally refers to data
sources and destinations
Example:
\
personal
computer,
\ terminals,
\
workstations,
\
computers,
\
automatic
teller machines(ATM)
~Transmission media(physical media)
Used to transmit data
in a networked environment
Transmit
signal/electrical pulse through a medium
2
types:
\
bounded/guided
o
Twisted
pair wire
o
Co-axial
cable
o
Fiber
optic cables
\
unbounded/unguided(air or a vacuum)
o
AM
and FM radio
o
TV
broadcasting
o
Satellite communication
o
Microwave
radio
.jpg)
o
Infrared
signals
o
bluetooth
~Network electronics devices
Control data frm
sources to destinations
Also act as interface
between different transmission media
Example:
(p.s. word in yellow are linked to website about it.)
\ Bridges
\
Concentrators
\
Routers
\
Front
End Processors
\
Private
Branch
\
Hubs
\
Gateways
~Software
Control data transmit
Send, end, display data
Measure the data
transmits to the destination
NOS - software control
a network and its msg
~Network architecture standards
Blueprint of standards
for a network
Consisting of choice of
media, media interfaces, encoding methods, transmission protocols, routing
protocols
needed to ensure
interoperability between various devices and equipment made by different
vendors.
bluetooth vs infrared
what i get on9 searching~~
As stated earlier, Bluetooth does not use infrared technology. The Infrared Data Association (IrDA) has introduced two standards: IrDA – Data, for high – speed, short- ranged, line – of – sight, and point – to – point data transfer, and IrDA – Control, for lower speed communication such as wireless keyboards, and joysticks. The range of IrDA is around one meter and requires line- of – sight between the transmitter and receiver. Moreover, IrDA communication is subjected to light interferences. The biggest advantages of IrDA over Bluetooth for point- to – point communications is its high throughput, which makes it suitable for multimedia applications requiring high – speed transmissions. However, Bluetooth has larger range, does not require line – of – sight, and is not prone to light interferences.
what i know~~
Infrared is most older technology and slower compared to bluetooth.
Both used for transferring data without wire but bluetooth is latest technology and fast
Bluetooth is prone to virus
By Mhui
No comments:
Post a Comment