Intro to IT

 
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Intro to IT
A blog made for my foundation course subject; Introduction to Information Technology.
Computer Networks
Sunday, October 25, 2009
A node is a connection point that acts as either an end point or a redistribution point for data transmissions. This is because it has the ability to recognize and process transmissions to other nodes. A cellphone is an example of what can be considered a node.


A client is an application that accesses a remote service on another computer system through networking. For example, when a user is making requests for pages from servers all over the Web using a Web browser, then the user is making client requests. There are generally three types of clients which are "fat clients", "thin clients" and "hybrid clients".


A server is a program that fulfills the requests from client programs. For example, a server will deliver web pages that are requested by a client.


A Hub contains multiple ports and is one of the most commonly used networking hardware devices. They function as central connection points for local area networks (LAN). A port copies a packet without modifying it to all ports of the hub when it arrives at one port for transmission.


Network interface cards (NIC) is used to allow communication between computers over a computer network. It is a computer hardware specially designed for this purpose. The NIC assigns a MAC (media access control) which is a unique address to a machine. It allows the communication between computers using the MAC addresses.


Network Operating System (NOS) is an operating system. It allows a computer to fulfill requests from other computers for data and provide access to other resources through a network.


Distributed Processing is where a computer system uses more than one computer, or processor, to run an application. Distributed processing can also involve distributed databases. This is where data is stored across two or more computer systems. Distributed processing implies that a transaction will be completed when more than one processor is involved in processing.



A Host Computer is a computer that is connected to a network. It provides services such as functioning as a store-and-forward processor, a packet or message switch, and it is also used to develop software for execution on a target computer. Host computers range in a variety of sizes from something as small as a small microcomputer to batch mainframes or large time-sharing.



Network Manager is a software that is used for simplifying the use of computer networks. A network manager is also known as a network manager. It maintains the hardware and software that comprises a network.
posted by Melissa @ 4:07 PM   0 comments
Input and Output
Sunday, October 4, 2009
Magnetic ink character recognition (MICR)




The banking industry, which is the primary user of MICR, uses MICR to facilitate the processing of cheques. MICR is a character recognition technology. It can easily be read by humans unlike other technologies such as barcodes. Magnetic ink or toner, usually containing iron oxide, are used to print MICR character in special typefaces. Even if the characters are overprinted or have been obscured by other marks, magnetic printing allows the characters to be read reliably.

Optical-character recognition (OCR)




The mechanical or electronic translation of images of handwritten, typewritten or printed text into machine-editable text is called optical-character recognition (OCR). It enables one to take a book and, by feeding it into a electronic computer file, enable one to edit the file using a word processor. Advanced OCR is able to read a variety of fonts. However, even the advanced OCR still have difficulty reading handwritten text.


Optical-mark recognition (OMR)



The process of capturing human-marked data from document forms
such as surveys and tests is called optical-mark recognition (OMR). Other applications of OMR are geocoding, community surveys and data compilation.

Dot matrix printer


It is a type of computer printer with a print head that runs back and forth or in an up and down motion, much like a typewriter. Tiny hammers in its print head strike pins over an inked ribbon to form images on paper. Most people prefer using ink jets and lasers over dot matix printers because they are cheaper, quieter, faster and produce output of better quality.


Plotters



There are two types of plotters and they are pen plotters and electrostatic plotters. Plotters are connected to a computer and is used to print graphical plots. It is a vector graphics printing device.


Photo printer



To print high quality digital photos on photo paper, one can simply use a photo printer. Photo printers are usually ink jet printers.


Portable printer



A portable printer is a lightweight and small printer that can be easily carried around. It is ideal for those who are travelling and who need to work. It is not only easy to carry around, it prints quite quickly and at a reasonable quality.


Fax machine



A fax machine is usually a combination of three things; an image scanner, a modem and a printer. It is a telecommunications technology. It is convenient and useful as it can be used to transfer copies of documents no matter the distance, be it short distance or long distance. The documents will reach the recipient almost instantaneously.


Multifunctional devices

Multifunctional devices can do a number of things such as copying, printing, finishing and scanning. It also comes at a reasonable price.


Internet telephones



An internet telephone is just like a regular telephone except that it uses the Internet to send voice. Unlike using regular telephones to talk to people, it is cheap and sometimes even free.


Telephony

The usage of equipment and technology to provide voice transmissions over long distances through electronic signals is called telephony. With the advance in telecommunications, it is difficult to differentiate between traditional telephony and telecommunications.


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posted by Melissa @ 10:24 PM   0 comments
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Name: Melissa
Home: Selangor, Malaysia
About Me: Not much you need to know about me. I'm 20, Sabahan, and a female with a slight obsession with anime/manga, the colour pink and writing. Everything else, I'll let my posts speak for me.
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