by 
yeejing
ANSWERS: 3
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That is what the server will detect. If not, it would not show the page itself, and it will give you errors. It is simply made to do it that way.
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Because convention indicates that if you enter a web url (such as www.website.com), the server hosting that site will automatically serve the file index.html, which acts as the front page or welcome page of the site. You can of course bypass that default page by putting a different file name in the url (such as www.website.com/music.html).
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We need not! Some websites use index.php, index.asp, index.shtml, index.htm, index.jsp, index.py, etc. It all depends on the configuration of the website. You can also use apache rewrite rules if you're using apache to make it otherwise.
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