Unable to detect ports in the additional NIC

I am facing an issue with a Dell server having CentOS 7. Other than the default LAN ports, an extra NIC (Broadcom5720 DP 1GB) has been installed in the server for network connectivity. The ports in this NIC are showing active but they are not functioning concurrently with the two default LAN ports in the server. At a time only 2 ports are shown activated.

How to activate all the 4 LAN ports so that all of them can be used at the same time?