Utilizing my incredible art skills, I drew a diagram for you:
http://i.imgur.com/WU6iGGv.png
A high level view of a fibre channel SAN should look incredibly similar, if not identical to your iSCSI network. The text is just describing the logical connections the various server ports can make, just like ethernet. Let me know if this this clears it up, or I'll go into more detail with whatever you'd like.