solve the bandwidth confusion once and for all, please!

Hi. Could someone provide a general overview of bandwidth and bandwidth calculation?

I already know the difference between 'data transfer' and 'bandwidth'. Also, I understand that to truly limiting bandwidth usage is hard (for example, someone who can telnet to your server can start downloading multi megabytes files or sending it somewhere else. The more evil ones can also do that via a PHP script, which will be recorded as the web user).

So, what I am still not sure with are:
1. is the data transfer allocated for outgoing traffic only, or does that also include incoming ;

2. how are the data transfer usually recorded by webhosts / ISP? is it in the router? server log files? And what is their methods?

Cheers!


[ I am evil, but I am a genius! ]

 

 

 

 

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