I am new to Linux Dedicated server hosting and plesk panel 11 , i am looking for inbuilt firewall module . Is it comes with free in plesk 11 or i need to pay or plesk 11 doesn't support firewall?. I looked at the demo http://www.parallels.com/products/plesk/demos/, but i couldn't find any information about firewall in plesk 11.
Indeed, Plesk 11 has free built-in firewall module. You just may not have it installed - if so, go "Tools & Settings > Updates & Upgrades" menu and install missing components.