First of all you would need to build the entire system to be HA. If you do not manage the networking/storage you need to work together with those teams.
For the networking side you could disconnect one cable/close the port and everything should keep working if you have redundancy and you have configured correctly the vSphere Environment. Here you have details on how to configure HA,DRS Create a vSphere HA Cluster . To test both HA and DRS you will need to have some machine running on the servers.