DNS terms


I'd greatly appreciate if someone could give me a quick run down on a few DNS terms? Answers in here would be preferred but if know of any good links please post.

PTR - used for reverse lookup zones. So you can do nslookups?
A records - maps host name to IP
CNAME ?
SOA ?
nameserver?

thanks
dissolvedAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Hi dissolved,
> PTR - used for reverse lookup zones. So you can do nslookups?
Yes, this helps with NSLOOKUPs as well as validating your system isn't faking it's name/address.

> A records - maps host name to IP
Yes.

> CNAME ?
Essentially an Alias to an A record.

> SOA ?
Start of Authority - best described here:
http://www.webopedia.com/TERM/S/Start_of_Authority.html

> nameserver?
Again: http://www.webopedia.com/TERM/N/name_server.html

Cheers!
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dissolvedAuthor Commented:
Much appreciated leew.

a-re cnames ever used in conjuntion with MX records?

-When/how is SOA and nameserver used? Would you mind giving a brief description?

Thanks!  
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Hi dissolved,
> a-re cnames ever used in conjuntion with MX records?

They could be.  If you registered your mail server as "god.mydomain.com" but wanted people to access it as "mail.mydomain.com" you would create a CNAME for mail to god.

> -When/how is SOA and nameserver used? Would you mind giving a brief description?
Sorry - I'm not quite sure how _I_ can describe this - but here's another link that might help you:
http://www.rscott.org/dns/soa.html

Cheers!
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marcin79Commented:
SOA is placed on the dns servers which are serving particular domain and only on those servers, when You receive a response from that kind of servers you have an authoritative response if you will receive a response from any other server you have an non authoritative response, cached by the server. The zones are edited only an the servers which are authoritative for particular domain.
MX record is pointing to the mailserver serving mail for a pointed domain, and you could use mx if you need two domian names for a mail server
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dissolvedAuthor Commented:
Authorative servers. What is the difference between them and non-authorative?
thanks guys
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