Welcome to euroopera.org
|
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.
Is That Free Offer Legit? Tips that Can Help Everyone loves the chance to cash in some great free stuff, but navigating the world of freebie offers, especially online, can be like navigating a minefield. Unfortunately, a lot of people out there use the love others have of taking advantage of free deals to scam them out of money or personal details that can be used in identity theft scams. All of this gloom and doom doesn’t mean that you have to give up on free things altogether, however. The good news is that there are some simple, common sense steps you can take protect yourself from online freebie scammers. These tips will help give you the confidence that you can enjoy taking advantage of free offers without the fear of ending up facing some negative consequences. First and foremost, when you are checking out a free offer on the Internet, take a closer look at the website, beyond just reading the words and figuring out what you have to do get the free goods. Does the website look like it was made by a professional, with some consideration, or does it look like a five minute amateur job? Are typos and clip art the order of the day, or does it look like a website any business would be proud to call its own? What about the web address – is a domain name that matches the business the website claims to represent, or is a “free” domain address that includes the name of the domain company in the address? All of these factors can be red flags that determine the difference between a scam and a legitimate free offer. If the website looks half hearted or doesn’t seem to exactly “match” the company it purports to represent, then don’t even think about trying to get anything from it. When you’re reasonably sure that the website is actually the front of a legitimate business, it’s time to turn your attention to the privacy policy of the website. The best privacy policies guarantee you that the email address you use to sign up for this offer will not be shared with any other companies – but when it comes to free stuff, those kinds of privacy policies are few and far between. Many companies cover the costs of the free things you get by selling your email address to other companies that may have offers you they think you might be interested in. If you can’t find a privacy policy that lets you opt out of getting unwanted solicitations, at least make sure the site is secure and that any personal information can’t be obtained by hackers. Other things to look out for when you’re looking for freebies is products that are free but that require you to pay a shipping charge that seems beyond the pale for what it should cost to ship and freebie offers that seem to ask for way more information than needed for what the product actually is. Twenty pages of personal information for a travel size bottle of shampoo? That doesn’t make sense, and it should set off warning bells in your head. All of these red flags aside, giving out some amount of personal information comes part and parcel with freebie offers. There are a few things you can do to make life easier on yourself. Set up an email account that you will use specifically for freebie offers so all of the inevitable spam doesn’t clog up your main account. Use a phony phone number (preferably one that can’t be anyone else’s, like one that starts with 555). Last but not least, if you’re unsure about an offer, keep on moving. Better safe than sorry. Bring These Important Tips to the Table in a Telecommuting Argument Are you tired of the sound of the alarm clock every morning? Are you equally tired of trying to figure out what to wear every day (ladies) and fighting the rush hour traffic to get to the office in time? How about spending almost your entire paycheck on gas to put in your car to get you to work? There is a way around all of this of course – telecommuting. When you telecommute to work, you can catch a little bit of extra shut eye and head to work in your pajamas, without even getting in the shower. But aside from the convenience factor, there can be a lot of other good reasons why telecommuting makes sense. If you can put together a convincing enough argument for your employer, you may find yourself going to work in your bedroom slippers before you know it. The first thing you have to keep in mind about your telecommuting argument is that you have to make sure you have plenty of evidence that telecommuting will be beneficial to your employer, not just you. Sure, you would love to be able to see the kids off to school in the morning and take your coffee break in front of your favorite soap operas, but your boss doesn’t care about all of that. Though you don’t have to hide the fact that telecommuting will obviously have its privileges for you from your boss, remember to include plenty of ammunition for benefits to the company as well. What can you bring to the table in terms of telecommuting advantages for your boss? Point your boss to a growing amount of research on the internet that shows that big companies have seen big increases in productivity when they started letting people telecommute and work from the comfort of their homes. Everyone knows that a rested and stress free employee is a productive one, and offices can be filled with more distractions than your home (gossiping employees, phones always ringing). Some companies have seen increases in productivity of over 50%, something that is sure to get your boss’s attention. You can also point out to your boss that absenteeism takes a nosedive when people telecommute. No need to take a fake sick day to get out of going to office when you work from home, and even when people are under the weather, when the office is in the next room, they still tend to get a few things done on a day that would have been a total write off otherwise. Another selling point for your boss may be that everyone else is already doing it. More than half of the companies in the US have employees that telecommute, with great results. Your boss won’t want to let the company fall behind – and your boss will know that offering what other companies have is important for employee retention. Make sure your boss knows that what you are asking for is not out of the ordinary in any way. Beyond the selling points for your boss, you can be specific about a few benefits to you. Bosses know that gas is major issue for employees – telecommuting is a way they can let you cut back on that big expense, without feeling under pressure to respond with wage hikes. If you have customers that live near your house, let your boss know it will be easier to meet them face-to-face if you work from home. Last but not least, let your boss know that you believe you can deliver more to the company from the comfort of your home - more work for the same pay is always music to an employer’s ears. |