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Introduction To IT
About Me.

My picture 1

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Hey. My name's Audrey. :)

Time

Chatbox.



Saturday, March 6, 2010

Computer Networks


1.Node

A node is a device connected to a computer network. Nodes can be computers, personal digital assistants (PDAs), cell phones, or various other network appliances. On an IP network, a node is any device with an IP address.















 2. Client

Client is the relationship between two computer programs in which one program, the client, makes a service request from another program, the server, which fulfills the request.














 3. Server

A device on a network that handles network resources. For instance, a file server is a computer and storage device created to storing files. Any user on the network can store files on the server.



















4. Hub

A network hub is a networking device that connects to one or more equipment to each other. A computer can connect to a server, printer and another computer through a network hub. It can be d to share files and information.















5. Network Interface Cards (NIC)

Expansion cards located within the system unit that connect the computer to a network. Sometimes referred to as a LAN adapter.
















6. Network operating system (NOS)


An operating system that includes special functions for connecting computers and devices into a local- area network(LAN).















7. Host computer


The main computer in a network: controls and performs certain functions for other computers.


















8. Network manager


A computer specialist responsible for efficient network operations and implementation of new networks.


1:17 AM



System Unit

Sockets


An Internet socket or network socket is an endpoint of a bidirectional inter-process communication flow across an Internel Protocol-ba sed computer network, for instance the Internet.
The term Internet sockets is also used as a name for an application programming interface or API for the TCP/IP protocol stack, given by the operating system. Internet sockets constitute a mechanism for delivering incoming data packets to the appropriate application process based on a combination of local and remote IP addressessand port numbers.



Chips


Chips became popular in the latter half of the 20th century because of their small size, low cost, high performance and ease to produce. A computer chip is a small electronic circuit, also known as an integrated circuit, which is one of the basic components of most kinds of electronic devices, especially computers. Computer chips are small and are made of semiconductors that is usually composed of silicon, on which several tiny components including transistors are embedded and used to transmit electronic data signals.



Slots

Expansion slots are located at the motherboard, and openings on the back of the computer allows the ports on the cards that go in the slots to be accessed. There are several types of expansion slots. Here are afew examples: AGP, PCIe (also known as PCIexpress), PCI and ISA.



Bus Lines

A bus is a subsystem that transfers data between computer components inside a computer or between computers in computer architecturing. Modern computer buses can use both parallel and bit-serial connections, and can be wired in either a multidrop (electrical parallel) or daisy chain topology, or connected by switched hubs, as in the case of Universal Serial Bus Port (USB).



Graphic Card




The images you see on your monitor are made of tiny dots called pixels. At most common resolution settings, a screen displays over a million pixels, and the computer has to decide what to do with every one in order to create an image. To do this, it needs a translator, something to take binary data from the CPU and turn it into a picture you can see.

Unless a computer has graphics capability built into the motherboard, that translation takes place on the graphics card. A graphics card's job is complex, but its principles and components are easy to understand.



Sound Card




A sound car enables a computer to produce and record original high-quality sound. It is an expansion board that helps manipulate and output sounds through a speaker. Sound cards are able to use two basic methods to translate digital data into analog sounds: 1.FM Synthesis - It imitates different musical instruments according to built-in formulas. 2. Wavetable Synthesis - It relies on recordings of actual instruments to produce sound and produces more accurate sound, but is more pricy.


Modem Card


A modem acts like a phone in your computer which allows you to connect to a network like a internet service provider over the phone line. It comes in landline and wireless varieties and functions to produce a signal that can be transmitted easily and decoded to reproduce the original digital data.



Network Interface Card


In computer networking, a Network Interface Card are more commonly known as NIC, provides the hardware interface between a computer and a network. A NIC technically is network adapter hardware in the form factor of an add-in card such as a PCI or PCMCIA card.



Plug and Play


In computing, plug and play is a term used to describe the characteristic of a computer bus, or device specification, which facilitates the discovery of a hardware component in a system, without needing physical device configuration, or user intervention in resolving resource conflicts.



Serial Port


In computing, a serial port is a serial communication physical interface through where information transfers in or out one bit at a time. Throughout most of the past of personal computers, data transfer through serial ports connected the computer to devices such as terminals and different peripherals.



Parallel Port


Parallel port is not only a simple tool but also a cheap tool for building computer controlled devices and projects. The primary function of a parallel port is to connect printers to computer and is specifically designed for this purpose. Thus it is often called as printer Port or Centronics port.



Universal Seriel Bus Port (USB)


Short for Universal Serial Bus, i is an external bus standard that supports data transfer rates of 12 Mbps. A single USB port can be used to connect up to 127 peripheral devices, such as mice, modems, and keyboards. USB also supports Plug-and-Play installation and hot plugging.



Firewire Port


Firewire ports are forms of a serial port that make use of FireWire technology to transfer data in high speed from one electronic device to another. Since 1995, the FireWire port has been in common use when Apple, Inc. first began to include the port on a number of digital camcorders. Today, the FireWire port is used on a number of other devices.


12:07 AM


Monday, January 25, 2010

Internet, Web & E-Commerce

Well, here are the things I have to blog about from Mr.Edward for today's class.


1.Business-to-Consumer (B2C)
2.Consumer-to-Consumer (C2C)
3.E-Commerce
4.Internet Security Suite
5.Javascript
6.Plug-In
7.Spam




Business-to-Consumer

Business-to-consumer or more commonly known as B2C and Business-to-Customer describes activities of businesses serving end consumers with products and/or services. B2C commerce happens when customers purchase products or services from a merchant whether in an online or brick and mortar environment.







Consumer-to-Consumer

This phenomenon describes transactions in which a consumer sells a service or product deirectly to another. Therefore, internet commerce happens when consumers interact with other consumers through online trades and auctions.






E-Commerce
E-Commerce is short for Electronic Commerce. It is the process of buying and selling of services or products over electronic systems such as the internet and other computer networks.




Internet Security Suite

A good internet security suite can help protect your internet system and lower the risk of your internet system and personal information to just about zero. It always keeps you away from online threats like viruses.





Javascript

Javascript is the netscape-developed object scripting language that is used in millions of web pages and server applications worldwide. In short, it is a dynamic scripting language supporting prototype based onject construction.




Plug-in

In computing, a plug-in consists of a computer programme that has an interaction with the host application to provide a certain function and is often considered the general term compromising plug-ins, extensions and themes as subcategories.







Spam
Spam is all kinds of unwanted online communication. Example of a most common kind of spam is the unwanted email or more known as junk-mail.



9:28 PM


Monday, January 18, 2010

Careers in Information Technology

Well, when one mentions IT, almost all would think of Information Technology. Some how, most people tend to assume that IT is a very specialised field where choices of careers in it are very narrow.

Therefore, I'd like to introduce some occupations which are available out there in the market for those of you who don't know but think you know it all. book=IT for dummies

First of all, here's a list to the very few career pathways I have chosen (ahem, Mr.Edward S.) to elaborate on.


1.Webmaster
2.Computer Support Specialist
3.Technical Writer
4.Software Engineer
5.Network Administrator
6.Database Administrator
7.System Analyst
8.Programmer




Webmaster

Webmasters a.k.a web developer, web architect and etc are people who maintain websites as they ensure that the web servers, software and hardware operates accurately. They also design, generate and revise websites as they reply users and examine the traffic of a certain site.


Pinocchio




Computer Support Specialist


Computer Support Specialist are people whom fix computers and figure out why it is facing a certain problem. They also install printers, software and other computer tools. Some specialists check the systems in the computer everday to make sure that it is functioning properly.







Technical Writer

A technical writer is also known as a technical communicator. A technical writer is a professional writer who write, createsm designs, maintains and updates technical documentation which includes white papers, online help, user guides, system manuals and more. They produce technical documentation for technical, business and consumer audiences.






Software Engineer


Software engineers are responsible in the design and implementation of various software programmes. They also test, debug and maintain systems that has been fully designed.






Network Administrator

A network administrator oversees a computer network ensuring they function smoothly without complications. It consists of a group of computers that are linked together to a central computer known as a server where files, programmes and other information are stored.
 


Did you know, the internet is the world's largest network?




Database Administrator

A database administrator (DBA) is responsible for the integrity, performance and security of a certain database. Besides that, they are also required to do planning, development and troubleshooting.






System Analyst

A systems analyst is responsible for researching, planning, coordinating and recommending software and system choices to meet an organization's business requirements. The systems analyst plays a vital role in the systems development process.






Programmer

Computer programmers provide step-by-step directions using a series of logical steps on how to process information. They can work in different fields such as manufacturing, industry, engineering, government offices, hospitals and educational institutions.









9:40 PM