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If the computer does not know the address of any DNS server, then it cannot resolve an address such as www.answers.com to an IP address and therefore cannot navigate to the desired website.

When an internet user makes a request to go to www.answers.com, the web browser sends the request out and has the DNS server resolve the address to an IP address so that the path to the server can be determined. After all, all nodes on the Internet are assigned IP addresses and it is with that information that each communicates with its upstream and downstream neighbors.

Think of it as being similar to sending a package to a friend's home by snail mail. You can't just write on there Joey Smith's house and give it to the mailman. You need to give the proper address for routing and delivery such as 123 Anywhere Drive, Timbuktu, Maine, 01234. Then the mail service knows precisely where to deliver the package. This is the purpose of the DNS server.

If there is no DNS server address on the machine in question, then one will receive "unknown host" or another similar message when using a common name. Instead, one would have to know the specific IP address of the website in question to be able to access it. For well-known sites that have static IP addresses assigned to their domains (such as answers.com, Amazon.com, Walmart.com, and others have), that is not much of a problem but when one tries to access various smaller business websites or personally-owned websites (such as those domains often used by local stores/firms or families), those can be hosted on "virtual servers" which means that each physical server may respond to requests for hundreds, if not thousands, of websites and, therefore, using just an IP address will not provide enough information to the web server to respond with the files for the appropriate website.

So, in other words, not having a DNS address configured for a machine can lead to a list of issues that complicate the otherwise simple task of web browsing.

I hope this helps. If you have any other questions or if any of this is as clear as mud and you need clarification, feel free to drop me a line.

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Q: What would happen if the computer was not configured to use a DNS serverWhat if you are out-of-town and did not bring your list of IP addresses What if you are visiting a friend and they did not kno?
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