RV110W can not support the 100m bandwidth

I have a Cisco router, the model is RV110W. This router is very good quality and very stable.
But,I found the problem. My ISP provider gave me broadband is 100m. But bandwidth is only 50m after connecting this router.
I have two questions, as follows:
1, the router can not support the bandwidth of 100m?
2, if the router supports 100m bandwidth, how should I set it up.