DNS is commonly employed by other application-layer protocols—including HTTP, SMTP, and FTP—to translate user-supplied hostnames to IP addresses.
- As an example, consider what happens when a browser (that is, an HTTP client), running on same user’s host, requests the URL www.dialog.lk/index.html.
- In order for the user’s host to be able to send an HTTP request message to the Web server www.dialog.lk, the user’s host must first obtain the IP address of www.dialog.lk. This is done as follows.
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