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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.
Web Hosting - Bandwidth and Server Load, What's That? Two key performance metrics will impact every web site owner sooner or later: bandwidth and server load. Bandwidth is the amount of network capacity available, and the term actually covers two different aspects. 'Bandwidth' can mean the measure of network capacity for web traffic back and forth at a given time. Or, it sometimes is used to mean the amount that is allowed for some interval, such as one month. Both are important. As files are transferred, emails sent and received, and web pages accessed, network bandwidth is being used. If you want to send water through a pipe, you have to have a pipe. Those pipes can vary in size and the amount of water going through them at any time can also vary. Total monthly bandwidth is a cap that hosting companies place on sites in order to share fairly a limited resource. Companies monitor sites in order to keep one site from accidentally or deliberately consuming all the network capacity. Similar considerations apply to instantaneous bandwidth, though companies usually have such large network 'pipes' that it's much less common for heavy use by one user to be a problem. Server load is a more generic concept. It often refers, in more technical discussions, solely to CPU utilization. The CPU (central processing unit) is the component in a computer that processes instructions from programs, ordering memory to be used a certain way, moving files from one place to the next and more. Every function you perform consumes some CPU and its role is so central (hence the name) that it has come to be used as a synonym for the computer itself. People point to their case and say 'That is the CPU'. But, the computer actually has memory, disk drive(s) and several other features required in order to do its job. Server load refers, in more general circumstances, to the amount of use of each of those other components in total. Disk drives can be busy fetching files which they do in pieces, which are then assembled in memory and presented on the monitor, all controlled by instructions managed by the CPU. Memory capacity is limited. It's often the case that not all programs can use as much as they need at the same time. Special operating system routines control who gets how much, when and for how long, sharing the total 'pool' among competing processes. So, how 'loaded' the server is at any given time or over time is a matter of how heavily used any one, or all, of these components are. Why should you care? Because every web site owner will want to understand why a server becomes slow or unresponsive, and be able to optimize their use of it. When you share a server with other sites, which is extremely common, the traffic other sites receive creates load on the server that can affect your site. There's a limited amount you can do to influence that situation. But if you're aware of it, you can request the company move you to a less heavily loaded server. Or, if the other site (which you generally have no visibility to) is misbehaving, it's possible to get them moved or banned. But when you have a dedicated server, you have much more control over load issues. You can optimize your own site's HTML pages and programs, tune a database and carry out other activities that maximize throughput. Your users will see that as quicker page accesses and a more enjoyable user experience. Reduce Employee Turnover and Produce a Great Employee For so many businesses in the United States it is the same picture they see year in and year out. Employees come, get trained, start to be efficient at work and then they leave. The company needs to train somebody new. To reduce employee turnover and produce a great employee, many things need to be established within a company as a support structure. Many companies so often neglect to ask and wonder what their employees might like or think would be helpful to make their work environment and conditions positive ones. Whether owning a small or a large company, your immediate concerns probably lie within making profits to be able to keep the company running and to be able to pay your employees. Of course, running a company takes a lot of effort and work hours spent solely on that. But every time one of your employees leaves, you loose capital--capital you have invested in his or her training and knowledge. The knowledge capital you loose is all the information that the employee has absorbed during his or her employment at your company and all the new skills he or she might have added during the course of his employment. So how can you make your company and working for your company more attractive and also produce great employees? There are many ways that this can be accomplished, most of them are rewards to the employee, but others that are just as important include the atmosphere and conditions at the workplace. This article will discuss just a few of the many possibilities you as an employer have to keep employee turnover low. For most employees, considering that they have an expectation towards the standard of living they have, a competitive salary is an important point. If you only pay minimum wages or never give raises and rewards, it is very unlikely to hold good employees that can make a lot more money somewhere else. To make their time worthwhile after hiring, you need to know what a competitive pay is and pay them either the average pay or slightly more. As for raises, raises together with evaluations will tell the employee that his or her effort and all the hard work he or she put into your company is appreciated. It also tells the employee how good his work is and what you will expect from him in the years to come. To produce a good employee, it is important to give the employee feedback on his work. Some companies reward their employees with bonuses for accomplished tasks or finished projects. Other companies will give their employees an award at the end of the month or year and generally attach a small bonus to that. Also consider a good benefit package. Many employees look for the benefits that companies offer to them and their family to make a decision whether they should work for this company or choose a different one. Often times, vacation is very important to employees. To be a motivated and good worker, employees need to spend time with their families or the things they love, like hobbies or sports. Yes, of course you would like them to work 60 hours for the 40 you pay, but consider this: an overworked overtired employee is most likely not able to work fast and efficient. That person also tends to be more error prone and unmotivated. Time off work to relax or regenerate is very important. Companies that offer ten days are often at the top of the list for employee turnover. Some companies offer flexible work times to accommodate for many different characters and situations at home. The employee that likes to come early and leave early versus the employee that likes to sleep long and then leave somewhat later feels just as welcome in this company or setting. Besides all these added factors, the work environment also plays a great role in producing great employees and reducing turnover. A respectful and good working environment is very important to keep employees happy and motivated. You know that a happy, motivated employee works better, faster and makes fewer mistakes. |