[squid-users] Traffic ???

Hi all !

I'd like to know if sites stopped/banned by ACLs cause traffic anyway.
I mean; if I pay for every byte that I receive from internet and in
order to reduce the traffic I decide to ban all the banner/advertising
sites, if my users still try to go on those sites or visit web pages
with banners, do those banned address still cause traffic that I'm going
to pay in the end ?
In other words, are the ACLs doing they're job _before_ (stopping the
address from beeing requested) or _after_ (stopping the browser from
displaying the contents) ?

Thank you

-- 
--------------------------------
|            __    __          | Valter DAL BO
|           /  \ /| |'-.       | e-mail: dalbo@tesco.it
|          .\__/ || |   |      |
|       _ /  `._ \|_|_.-'      | Tesco TS S.p.A.
|      | /  \__.`=._) (_       | http://www.tesco.it
|      |/ ._/  |"""""""""|     |
|      |'.  `\ |         |     | tel.: +390113011711
|      ;"""/ / |         |     | fax : +390113140362
|       ) /_/| |.-------.|     | mobile: +393357707810
|      '  `-`' "         "     | C.so Tazzoli 10137 Torino ITALY
--------------------------------