| NETWORK |
NETWORK
is a collection
of computers and mobile devices connected together via communications
devices and transmission media, often wirelessly allowing
computers to
share resources (hardware,software, data information)
Usage
of Computer Networks
- Sharing an Internet connection among
several users
- Sharing an application software,printers
and other resources
- Exchanging files among network users and
over the internet
Communication
Device :
Hardware component
that enables a computer to send (transmit) and receive data,
instructions, and information to and from one or more
computers
| Component |
Definition |
| Hub/Switch |
A communication device that enables a computer or
device that does not have built-in networking capability to access
network. |
| Modem |
A device that enables a computer to communicate
over analog networking media such as connecting the Internet via
telephone lines
Wireless
modem → Modem
that connects to the serial port but does not connect to telephone
lines. It receives through air.
|
| Wireless access
Point (WAP) |
A communication device that enables a computer or
device that does not have built-in networking capability to access
network. |
| Router |
A device that connects multiple networks together
, routes packets to their next location in order to efficiently reach
their destination. |
| Hub |
Device that provide a common central connection
point for nodes on network. |
| Switch |
A device that used to connect multiple devices on
a single (typically wired) network ; forward packets to only the
intended recipient. |
| Network
Interface Card (NIC) |
An adapter / expansion card that connects a
computer to a network.
Wireless
NIC → An
expansion card through which a computer can connect to a network that
provides wireless data transmission.
|
Transmission media
:
The materials or
substances capable of carrying one or more signals.
| Component |
Definition |
Physical
☆
Send signals
through cable, wire or tangible
materials
|
- Twisted-pair cable ⇒ Physical transmission
media which the cable consisting of pairs of copper wire that are
twisted together
- Coaxial cable ⇒ A networking cable consisting
of center wire inside a grounded, cylindrical shield, capable of
sending data at high speeds
- Fibre Optic cable ⇒ Physical transmission media
that consists of dozens or hundreds of thin strands of glass or plastic
that use light to tansmit signals
|
Wireless
☆Send signals
through the air or space
|
- Infrared ⇒ Send signals using infrared light
waves from one device to another
- Microwaves ⇒ Waves that provide a high-speed
signal transmission using electromagnetic radio wave (P1 WiMax)
- Cellular Radio ⇒ a form of broadcast radio that
is in wide use for mobile communication
- Broadcast Radio ⇒ Distributes radio signal
through the air over long distances
- Communication satellite ⇒ A space station that
receives microwaves signals from an earth-based station
- Bluetooth ⇒ A networking standard for every
short-range wireless connections ; the devices are automatically
connected once they get within the allowable range
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