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If we type a domain name in a web browser address bar, how will it discover the correct protocol for that domain ?

If we type in a web browser address bar, how does it know to add http://.....
--> ex : .......

Also, if we didn't mention ftp it will automatically add ftp://......

How does this all work ?

share|improve this question
Before give negative vote update my mistake in add comment field. – Kumar Oct 10 '12 at 5:59

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