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Why ad to DNS?

I am setting up some Virtual Servers on a platform different from ESX called Virtuozzo.

I just checked with our admin on what the best method is for adding servers and he said to pick a high IP on our subnet.  I've done that and the server seems to function but one cannot ping the machine name as is possible when the IP has been "added to DNS".  Our admin says for right now, we don't need to add it.

I'm trying to understand because I think I may have given him the "blank stare" when he said that.

In brief, what is the purpose of DNS.  Why is it OK to leave it out?
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DNS stands for "domain name system".  basically it resolves ip addresses to domain names, and vice versa.

check here for more detailed explanation:
>>Why is it OK to leave it out?

forgot to answer this one.  its ok, because you do not *have* to access a server by its name.  you can get to it just the same by using the ip address you assigned to it.
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