Know How DNS Works - So when the...
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So when the nameservers caches receive an IP address, it receives the TTL with it. The nameserver caches the IP address for the period of time then discards it.
When a process needs to determine an IP address given a DNS address, it calls upon the local host to resolve the address. This can be done in variety of ways:
Table look up. On UNIX hosts, the table is /etc/hosts.
The process communicates with a local nameservers. This is named on a UNIX system.
By sending a massage to the remote system that is identified from the information in the file/etc/resolve.conf.
When a nameserver receives a query for a domain that is does not serve, it may send back a referral to the client by specifying better nameservers. Typically operate in the recursive manner wherein any DNS server passes requests it cannot handle to higher level server and so on, until either the request can be handled or until the root of the DNS name space is reached.
The nameservers contain pointers to other nameserver with the help of which it is possible to traverse the entire domain naming hierarchy. A host with the initial nameserver addresses has to be configured. After this, it is able to use DNS protocols to locate the nameserver responsible for any part or the DNS naming hierarchy.
Thus when a nameserver receives a request, it can do one of the following:
Next: It can answer... >>
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