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Web Hosting - DNS, How The Internet Keeps Track of Names
The way computers communicate is, in a way, very similar to something very familiar: the postal system that delivers letters and packages. Here's how...
The Internet is just what the name suggests, a large inter-connected set of networks. But those networks are pointless without the one part that forms what is called their 'end-nodes', otherwise known as computers. Those computers often need to share information because the people who use them want to share information.
But, in a system where there are millions of separate computers, how can you enable them all to communicate? One very important feature of that solution is performed by something called DNS, the Domain Name System.
Every part of a network that is going to send or receive information is assigned an IP address. That's a numeric identifier that uniquely specifies a particular 'node', such as a computer, a router that directs traffic or other component. They look like this: 209.131.36.158
But those numbers are more difficult for people to remember and work with. They also aren't very attractive from a marketing perspective. So, a naming system was layered on top of some of them, mostly the computers involved, though routers have names, too.
But once you have a system that associates a unique IP address to a given name, you need some way of keeping track of all of them. That's carried out by several different pieces of the system: Name Registrars, DNS Servers and other components.
The Name Registrars, overseen by IANA (Internet Assigned Numbers Authority) and other international bodies, provide and keep track of domain names. When you register with GoDaddy or any of a hundred other intermediate companies, ultimately that information makes its way into a number of specialized databases stored inside DNS Servers.
A DNS Server is the hardware and/or software that tracks and forwards the IP Address/Domain Name pair from one place to the next. In many cases, there are a number of them between your browser and the remote computer you want to share information with.
Suppose you request information from, say, Yahoo's site by clicking on a link on their site. DNS resolves (translates) the name of WHO IS making the request and OF WHOM, to addresses, then passes the request through the network to the requested IP address. The requested data is then passed back through the mesh of network components to your computer and displayed in your browser.
Whether the communication is between a desktop computer and a server somewhere, or between one server and another, the process is essentially the same. DNS servers translate names into IP addresses and the requests for data are forwarded on.
In some cases those DNS servers are part of a specialized network computer whose sole job is to do the translation and forwarding. In other cases the DNS software may reside on a server that also houses a database of general data, or stores email, or performs other functions.
But however complicated the chain or the parts, the basic process is simple. Translate the name to an address, just as the postal system does. Whether international or local, your name is associated with an address, and the deliveries are made to the address, then forwarded to a particular name.
Three Important Tips to Land Better Job Prospects If you are not satisfied with your current job or the job prospects that you are running across, it is time to revise your search. Use these three tips to help find the type of job prospects you are looking for. First of all, before you start your job search, figure out exactly what it is that you are looking for. Going out into the world and searching for any type of job is the perfect way to end up with an array of job prospects you are unsatisfied with. Think about the reasons why you are ready to leave your current job. Consider what things you are looking for in a career that your current job is not giving you. Are you looking for make more money? If so, only apply for jobs that will increase your income. Are you tired of working long hours and weekends? Then do not apply for jobs that will keep you at the office after hours and during family time on the weekends. By defining what exactly it is that you want in a job, you will be able to weed out the jobs you do not want. Once you are able to concentrate on the select few that have the qualities you are looking for, you will be able to put froth the effort necessary to get those jobs. Another thing that many people do when they are looking for a job is underestimating their own skills. You do not want to apply for jobs that you have absolutely no skills or training for unless they offer training, of course, but you can apply for jobs that you have some of the skills to do. For instance, if you are apply for an office job where that you need to be able to maintain the company website and you are familiar with the components of designing and maintaining a website, but have not done it on a regular basis, apply. On your resume explain that you have a working knowledge of html and other website tools. That way the employer will understand that you are not an expert at the task but you are capable of beginning, and with some help, finishing the task. Never misrepresent your skills on a resume. Instead, be honest and place emphasis on the skills that you do have. Apply for jobs that you have some of the skills for only. If you get an interview, be ready to impress the interviewer by being totally prepared. Speak confidently and make eye contact. Confidence can take you a long way when it comes to the job hunt. Shoot for the stars! If you want better job prospects you will need to believe that you deserve a better job. That means you will need to have some faith in yourself and be willing to apply for higher-level jobs. The only way you are going to get better job prospects is if you apply for the better jobs. Do not be intimidated by job descriptions. If you read a list of responsibilities and you cannot perform all of them yet, apply for the job. There is a good chance that you will be asked if you can perform the specific tasks of the job when you get an interview. This is the time to explain what tasks you are capable of performing. Better job prospects are highly attainable. You just have to clearly define what it is you want from a job and believe that you deserve and will get that type of job. Believe in yourself and you are halfway there. The History of Writing Tools (history of writing tools) Writing tools are essential to written communication. A person is not able to write without the proper writing tools. However, many people don’t realize that writing tools did not just pop into existence; writing tools have a long history. Writing tools have helped societies write their history and bring civilizations to life. The history of writing tools begins with the cave man that invented the sharpened-stone, which was later developed into the first writing tool. Cave men used these instruments to scratch pictures onto the walls of cave dwellings. The drawings were said to represent events in the daily life of the cave men, such as the planting of crops and hunting victories. Clay was later discovered, which made portable records possible, and many merchants of the time used clay token with pictographs to record the quantities of materials being traded and shipped. The Greeks developed the earliest form of pen and paper. They used the writing stylus, which could be made of metal, bone, or ivory, to make marks on wax-coated tablets. The tablets used by the Greeks were made in hinged pairs that were closed to protect the scribe’s notes. Cadmus was a Greek scholar who seemingly invented the written letter, which is a text message on paper sent from one individual to another. The written letter proved to be a major event in the history of writing tools, and was the starting point for the development of ink. “Indian Ink” was developed by the ancient Chinese society, and perfected for writing. The ink was originally designed for blacking the surfaces of raised stone-carved hieroglyphics, but was later used for writing. This early ink was made of a mixture of soot from pine smoke and lamp oil mixed with the gelatin of donkey skin and musk. By the year 1200 B.C. the ink had become common as a writing tool. Inks were also developed by other cultures, who used natural dyes and colors derived from berries, plants, and minerals to create them. The different colors of inks had ritual meanings attached to each color in early writings. In the history of writing tools the development of ink paralleled the introduction of paper. Early cultures such as the Egyptians, Romans, Greeks, and Hebrews used papyrus and parchment paper to write on. Romans invented a reed-pen for parchment and ink, from the hollow tubular-stems of marsh grass and the jointed bamboo plant. The bamboo stems were converted into writing tools that resemble the fountain pen. The plant was cut at one end into the form of a pen point, and ink filled the stem, by squeezing the reed, writers could force the ink from the point and write on parchment paper. The early forms of ink and paper were great developments in the history writing tools, but were often unstable. A stable form of ink was developed in 400 A.D., which was a composite of iron-salts, nutgalls, and gum. The ink was seen as having a bluish-black hue when applied to paper, but quickly becoming a darker black color, and fading after years and appearing as a dull brown color. The Chinese created a wood-fiber paper in 105 A.D., but it was not known to other cultures until 700 A.D. when the Japanese learned the secret. Eventually, the wood-fiber paper was brought to Spain in 711 A.D., but was not widely used in Europe, as most European societies did not use paper until the 14th century. The quill pen is also a major invention in the history of writing tools. The quill pen was introduced to the world in 700 A.D. The pen was made of bird feathers, and the strongest quills were typically taken from live birds from the outer left wing feathers. After the development of the quill pen, plant fiber paper became the popular medium for writing. Then another invention changed the history of writing tools; Johannes Gutenberg invented the printing press. This invention has led to various other developments in printing and writing tools. Writing tools are essential to writing, and without the development we would not be able to show others our ideas and thoughts. |