chapter 3 Flashcards
Refers to the physical equipment or components of an electronic data processing. It is also composed of input, output and storage and network devices.
Computer Hardware
These are the hardware devices which take information from user of the computer system, convert it into electrical signals and transmit it to the processor.
Input Devices
A computer hardware that used to input text characters and other commands.
Keyboard
A device that used to
point to and select items
on your computer screen.
Mouse
A Device that used to
transfers images or text a
computer there are special
models the negatives or to scan
book.
Image scanner
It is low resolution video
used to provide visual
input.
Web Camera
This is an input device to input
sound that is then stored in a digital form.
Microphone
This is used to add sounds.
Microphone
It is used to present information to the user from a computers.
Output Devices
Take’s data from the computer system and convert it to a form that can be read by humans.
Output Devices
The most important difference between these types is the technology used to create an image.
Monitor
The most common
monitor type, red, green,
blue electron beams.
Cathode-ray (CRT)
Most
tv’s used this technology
Cathode-ray (CRT)
Is commonly used in laptops
and some projectors.
Liquid crystal display (LCD)
It consist of two polarizing filters with a liquid crystal solution.
Liquid crystal display (LCD)
This Is a technology used in projectors, projectors
use a spinning color wheel with a microprocessor controlled array of mirrors called a digital micromirror device (DMD)
Digital light processing (DLP)
output devices that create hard copies of computer files. Some specialize in particular applications.
Printers And Fax Machines
Output devices for audio.
Speakers and Headphones
Alternatively referred to asdigital storage,storage,storage media, orstorage medium, astorage deviceis anyhardwarecapable of holding information either temporarily or permanently.
Storage Device
The picture shows an example of adrobo, an external secondary storage device.
Storage Device
One of the most common types of storage used with computers.
Magnetic storage device
Another common storage
device is this lasers and
lights as its method of
writing and reading data.
Optical storage device
Has started to replace
magnectic media, it is
more efficient and
reliable.
Flash memory
Early computers had no method
of using any of the above
technologies for storing
information, these form is
rarely used.
Paper storage
It operates at the physical layer.
Repeater
Its job is to regenerate the signal over the same network.
Repeater
It is basically a multiport repeater. A connects multiple wires coming from different branches.
HUB
These are the hubs which have their own power supply and can clean, boost and relay the signal along the network.
Active HUB
These are the hub which
collect wiring from nodes
and power supply from
active hub.
Passive Hub
These hub relay
signals onto network
without cleaning and
boosting.
Passive Hub
It operates a data link layer.
BRIDGE
This is a repeater, with add on functionality of filtering content by reading the MAC addresses of source and destination.
BRIDGE
It is used for interconnecting two LANS working on the same protocol.
BRIDGE
These are the bridge in which the stations are complexly unaware of the bridges existence i.e.
Transparent Bridge
This is used ontoken ring networks, and is standardized in Section 9 of theIEEE802.2 standard.
Source Routing Bridge
The operation of the bridge is simpler (spanning tree protocol is not necessary) and much of the bridging functions are performed by the end systems, particularly the sources, giving rise to its name.
Source Routing Bridge
It is a multi port bridge with a
buffer and a design that can
boost can perform error, it
divides collision domain of host.
Switch
In order for devices on the
network to connect to
theInternet, theroutermust
be connected to a modem.
Routers
Therefore, mosthave a specific Ethernet port that is designed to connect to the Ethernet port
Routers
It is a passage to connect
two networks together that
may work upon different
networking models.
Gateway
Also known as a bridging router which combines features of both bridge and router.
Brouter
It is working as a bridge, it can filter local area network traffic.
Brouter
