Time Behind
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What is the logic behind taking time (approx 30 secs)before appearing the download link?
While downloading from some sites, before the downloading option appears it takes almost 30 seconds.There must be a good reason behind it. I just want to know what is the logic actually....
The scenario is you want to connect to a web server of a particular IP
address.
There are some servers known as DNS . These are Domain Name Server. Each web-server has its own Domain Name server
It is the work of this server to Convert the Name into the IP address.
Let us consider you and me as the client for the web-server. The Scenario now is that the client wants to connect
to the server but the client don't know the IP address of the server it just know the Domain name so can the client
connect to the Domain Name server of the web-server and get the IP and then connect itself to their server?
No the Client without knowing the IP address of the server it has to collect the IP and then with the Ip only
it can establish connection.
What does the client do in order to know the IP .?
THere are 10 ROOT DOMAIN NAME SERVERS IN THE WORLD,when the client enters the domain the Local Domain Name Server
of the client is checked whether it has any Cache and in that the IP is available for the requested domain.
The Local Domain name server will contain the IP address if an only if the Domain has been visited previously.
In this case the IP address is retrieved from the local Domain Name Server
and the connection is established
between the client and the requested web-server.
Now what if the local Domain Name Server doesn't contain the IP address of the requested Domain.In such a case
the Local Domain name server contacts the root Domain Name server. The root Domain name server just looks at
the ending portion of the domain whether it is .com or .net or so , then it transfers the control to the DNS server of .COM
.net or the specified Extension. Then in this case let us consider client has requested for an .com website.
So now the control has been transferred to the .com Domain Name server. Now the .com Domain name server reads the sub-domain or the domain
itself if there is no sub-domain and it points or transfers control to the Domain Name Server of the requested
web server.
Now the control has been transferred to the requested web-server's Domain name server. This Server has the IP address of its web server and it gives it to
the client.
Now the Client has got the IP address of the requested webserver and it connects to the website directly.
This process takes some time and hence the delay of 30 seconds.
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