diffrence between

[Mike Burger]

> hello all,
>
>                 i am trying to make DNS server. i wanna knw diffrence b/w
> domain and zone?
>
>                 exat mean of TTL.
>
> thanks

For the most part, domain and zone are interchangeable terms.

TTL is how long the entry will live in the cache of another name server
after it's done a query against your name server.

For example...a DSL customer is configured to use their ISP's domain server.

They want to visit www.yourdomain.com, your DNS server hosts the
yourdomain.com domain, and you've set the TTL for yourdomain.com to 30
minutes.

The DSL customer inputs http://www.yourdomain.com into their web browser. 
Their PC makes an inquiry to the ISP's DNS server for www.yourdomain.com. 
Then, the ISP's DNS server contacts your DNS server for
www.yourdomain.com.

Now, the ISP's DNS server will cache the IP for www.yourdomain.com for 30
minutes, so that subsequent lookups don't have to go any farther than
their DNS server.  After 30 minutes have passed, the next query for
www.yourdomain.com that is presented to the ISP's DNS server will again be
passed to your DNS server.

-- 
Mike Burger
http://www.bubbanfriends.org

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