The ‘index of / ‘ is just saying that your looking at a directory that doesnt have an index file, like index.html, that is getting parsed. If the directory is empty, there’s no files displayed.
Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/184.108.40.20635 Server at http://www.avintel.com Port 80
This is called a ‘sever signature’: http://httpd.apache.org/docs/2.0/mod/core.html#serversignature
The values the signature contains are the various versions of server software running on your web server;
Nothing to worry about - be better to not have so much detailed info - but - it’s normal.