Why do you need your own DNS?

Question

Domain Name System

As I understand it, DNS is a server that translates a "human" request into a "machine" one. That is, for example, toster.ru at 178.248.232.5
To speed up this work, domains and ip are cached in ... the browser, probably ?. I know that there are about a hundred DNS servers around the world, located depending on the distribution of traffic, which process all these requests. So. And while I was studying this whole topic more than once I came across the fact that you can put your own DNS. But why is he needed, his own? I haven't found a clear answer yet. Thanks in advance!

Answer 1

Also, to speed up this work, domains and ip are cached in ... the browser, perhaps?

In the DNS cache of the OS and router, if it supports such a feature.
On the local network in order to access devices by name and not to fill in the static IP with everyone. You give the network printer the name "RetailsPrinter" and pour the settings, where it is cut by name, and the name is taken from the DNS server, and even if the IP changes, it will still be available.
It is clear that there is no reason to make such requests to the DNS registrar.
Well, to speed up DNS resolution, for example.
More to restrict access.

Answer 2

> while studying this whole topic more than once I came across the fact that you can put your own DNS.
> But that's why it is needed, your own? I haven't found a clear answer yet.
Find the answers yourself as needed.
They use their DNS servers to speed up queries when you need to organize your own namespace in your corporate network, for example.

Answer 3

In the local network, you definitely need your own DNS. HELL without it you will not deploy even. An external dns is also needed if you have your own mailer, a web-based chtototam, and in general you are a supporter of "all your own". Bind can serve both external and internal zones at
the same time.

Answer 4

First of all, it is needed if you are going to create and maintain your own DNS zone / s. Although it is also not necessary, you can buy a service from a hoster, he will host your zone on his own.
In general, if you don’t know why you need to install a DNS server, then you definitely don’t need it :)