Is there anyway to limit bandwidth speed?

Hi, I have a dedicated server that have guaranteed network speed is 500mbps but on of my site using average 800mbps, so my service provider is suggested me to limit bandwidth speed from server level, so my question is how can I limit speed for one account or for full server?

I am using centos 7.2 with WHM

 

Have a look on WonderShaper probably the most easy way to control your networks adapter.

 

You can load ratelimit module in apache. but this limit only your http traffic.