The 8 Network Types

There are about eight types of network which are used world wide these days, both in houses and commercially. These networks are used on the bases of their scale and scope, historical reasons, preferences for networking industries, and their design and implementation issues. LAN and WAN are mostly known and used widely. LAN, local area network was first invented for communication between two computers

LAN operates through cables and network cards. Later WLAN, Wireless local area network was formed through LAN concept, there are no wires involved in communication between computers, and Wireless LAN cards are required to connect to wireless network. LAN is the original network out of which other networks are formed according to requirements. They are as follow.

what does ".com" means ?

".com" web address does not mean "communication". And no, it does not mean "computer" either.

Interestingly enough, .com describes that a web site has some kind of "commercial" intent. This is what we call a "top level domain" address, and it used to be a way for a web site to convey its publishing intent.

When the World Wide Web was launched in 1989, these top level domains were used to help categorize the few hundred web sites at the time. Historically, .com web site addresses were for those publishers out to make some kind of profit through their Internet services.

What is The Difference Between Static and Dynamic IP Addresses?

A static IP address is an address that does not change over time unless changed manually. It is used when you need the IP address or network location to remain the same consistently. A good example of this is for a web server.

If you go to www.google.com you are really going to the IP address of 66.102.7.99.

If this were to change suddenly you would not be able to get to Google unless you knew the new IP address or until Google updated their DNS records.

A Dynamic IP address is an address that keeps on changing. It is mostly used when having a consistent

How Do Choose the Best HD Digital Video Camera?

The HD digital video camera is considered by many experts to be a major advance in the world of film. In addition to the creation of high-end cameras used to make major motion pictures, the arrival of high-definition cameras in the open market allows consumers to record high quality images that can be processed and stored without the expense and additional complications of using film cameras. In choosing the best HD digital video camera, budget, camera experience, and planned usage are important, but consumers may also want to take time to understand the basic technical specifications of different models.

An HD digital video camera allows the user to record in high definition, which provides a much higher quality image than standard definition cameras. Most HD cameras record at a resolution of 720X1280 or 1080x1920 pixels per frame. Although these resolutions may be indistinguishable from one another on a basic television screen, each provides a quality of image far greater than standard definition can offer. Increased resolution means that images will appear sharper and more clear, allowing viewers to see enhanced detail.

What is a Plotter?

A plotter is a very versatile tool. It is sometimes confused with a printer, but a plotter uses line drawings to form an image instead of using dots.

A common type of plotter is one that uses a pen or pencil.
 usually held by a mechanical “arm,” to draw lines on paper as images are typed. It may be a component that is added to a computer system or it may have its own internal computer.
It can be used to create layouts, diagrams, specs, and banners.



A plotter may use multiple pens and pencils, which can be easily be changed out in order to create drawings of a different color or drawings that contain more than one color. A plotter is preferred over a printer in many commercial applications, including engineering, because it is far more exact.

Do Batteries Really Last Longer if They are Stored in the Refrigerator?

The storage instructions on a typical package of household alkaline batteries usually advise consumers to store them in a cool, dry space. This advice is generally meant to discourage the storage of batteries in hot, humid places such as kitchen drawers or glove compartments. One popular rumor about the storage of batteries suggests keeping them in a refrigerator or even a freezer to extend their shelf life. Modern science has weighed in on this rumor, and the final answer depends on what type of batteries are involved and the definition of "extended shelf life".
For the most part, many experts say, the practice of storing batteries in a refrigerator creates more problems than it solves.

Household alkaline batteries generate their electrical power through a chemical reaction. Each battery contains alternating layers of two different metals and an alkaline liquid which acts as an electrolyte. When an electrical circuit is complete, free electrons flow out of the positive poles of the batteries, move through the device, and return to the batteries through the negative poles. This process continues until the electrolyte fluid can no longer keep the free electrons flowing. As long as unused batteries are kept in a cool, dry space, they could remain usable for five years or more. The electrolyte fluid retains an estimated 90% of its power as long as the batteries are not allowed to overheat or become unsealed.

what is a Pixel ?

Pixels are dots used to display an image on a screen or printed matter. The words pixel is a blend of the words picture and element. Usually the term refers to pixels in a digital context, but it is often more generalized to refer to any smallest unit of an image.

It is important to recognize that pixels are not a measure of size, though often the term is used as though they are. Many digital cameras, for example, give a measure of pixels-per-inch (PPI), which they embed in the image files created. Users then see this measurement and assume that pixels have a real size which uniformly holds true.

A monitor is made up of many millions of pixels arranged in a grid. Monitors also have a bit depth, which controls how many greys or colors each pixel is capable of displaying. In an 8-bit display, for example, each of the pixels can display 8 bits worth of color, equal to two to the eighth power, or 256, colors. With 24-bit displays, each of the pixels can display in excess of sixteen-million colors.

Laptop LCD LED TFT & OLED Screen Types Explained

Knowing what LCD, LED and OLED screen types is essential when buying laptops. You will surely come across these technical terms for laptop screen types and leave you in a state of confusion if you don’t know the difference between these laptop screen types. This brief guide is intended not for the purpose of depth technical analysis of the screen technologies in place but to help an average computer literate person to keep with these latest developments and to help them make an informed buying decision.


LCD
LCD has been the typical display type for laptops for quite a while, its almost the standad display type that you get with common laptops being sold these days. LCD screens consist of liquid crystals that are formed and activated by passing an electric current through them and are constructed of layered glass or plastic.

What is a Dongle?

A dongle is a piece of hardware that attaches to a computer in order to make a piece of secured software run. A dongle in this sense is used as a high-end form of security to prevent the unauthorized copying of software, since making a copy of the hardware itself is much more difficult than simply copying the software. The fairly absurd word seems to have been chosen more or less at random as a placeholder to describe the device when it was first used, and over time it was adopted as the actual name.

he primary use of a dongle today is in very expensive software, usually aimed at a small core market. Very expensive rendering and audio mixing software, for example, often makes use of a dongle to ensure that people don’t pirate the programs – which may cost many thousands of dollars for a single license. Computer Assisted Design (CAD) software is another area in which the use of a dongle is not uncommon.

IT Certifications That Matter

Choosing a professional to manage your company's network, hardware, and software is no easy task. How can you tell whether the skills listed in a person's résumé reflect the tech expertise your business needs?

ertifications that IT pros use to sell their services amount to an alphabet soup of incomprehensible acronyms. Nevertheless, 68 percent of IT hiring managers regard these labels as a medium or high priority, according to CompTIA, the largest vendor-neutral certifying group.

In this guide, we'll examine which of these certifications matter, and which technical skills a given certification implies.