give one reason why each computer on the internet needs to have unique ip address
Answers
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When you put a website on the Internet you have a number of options when it comes to hosting. Most people don’t go through the expense or the hassle of setting up their own server and effectively becoming their own web host. So their other options would be to use a dedicated server or shared web hosting.
With shared web hosting there may be hundreds or even thousands of websites on the same server. With that many websites on one server, all of those websites will often share one IP address. There are some inherent dangers when your website is sharing an IP address with hundreds of other websites. Sometimes people do shady things on the Internet and if you are sharing an IP address with a website that is blocked or blacklisted, your site may suffer as well.
If your web host offers a dedicated server, you will be able to have your own, unique IP address for your website. This makes it impossible for your website to be affected by the shenanigans of other webmasters. A unique IP address offers a layer of protection and greater security and reliability.