I want to prevent clients from downloading a lot of bandwidth on one network. How can I prevent this?
cPanel & WHM only offers support for our implementation of bandwidth limiting features which only imposes a limit on the entire account, and only works to suspend the entire website in Apache.
If you wish to limit bandwidth per IP address, you would need to partner with your hosting provider or datacenter to see if they offer any sort of service for this. Otherwise, you would need to implement your own custom solution with a firewall or configurations per service
For example, Apache has a ratelimit module that you may find a use for: