Net

The NET section is located in reference space. It contains a list of the defined net names; each net name can be followed by a list of package/pins that attach to that net. A Net determines which conductors can be connected together without creating a short, as opposed to a Node which implies a physical connection exists. PackagePins from different Packages may be on the same Net, but this does not mean they are directly connected.

(Net
 (Name 'UNDEFINED')
)

Via

A via is used to connect conductors from one layer to another. The syntax for the via will be defined shortly.

(Via
 (Name 'V-1')
.
.
.