This required 10 GbE network connects the SPARC T4-4 servers to your existing client network and is used for client access to the servers. 10 GbE NICs installed in the express module slots are used for connection to this network. The number of 10 GbE NICs and the express module slots that they are installed in varies depending on the type of configuration that is set up on the SPARC T4-4 server.