What you have configured is good. Think the Fex-fabric ports as a internal path between N5K and N2K, just like the path between supervisor and a line card. You don't need to configure trunk or access mode on it.
I'm working on a project that includes basic router configurations. I configurated everything including: line console 0, line vty 0 15 and secret passwords. There are 3 routers in the network and every LAN is going t...