The documentation for Insight Network sensor mentions that NICs should be 1Gb and 10Gb, and if the network requires more bandwidth, one should add more sensors. Does it support the use of 25Gb nics?
If the documentation is correct/complete, only 1GB and 10GB Interfaces are supported.
However, I guess it’ll work with faster connection speeds as long as the OS, on which the network sensor is installed, supports the NIC.
You can use NICs which are capable of 10Gb+ speeds. One thing to watch is you also need to multiply the other system requirements such as CPU cores and memory allocation.