Running WP-CRON on wordpress network


I am trying to establish if, by running WP-CRON as a scheduled task via my websites cpanel will this mean that WP-CRON runs on all instances of sites on my network.

E.g. is my main network installation and has a wp-cron scheduled to run every day is a domain that points to the network and runs a site on the network using your plugin 'domain mapping tool'.

What I need to know is if by running wp-cron every day on the main network domain will this mean it automatically runs on all sub-domains as well?

Hope someone can help!