The ornamental design for a networkset-top box, as shown and described.
FIG. 1 is a front perspective view of a network set-top box, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top view elevational thereof; and,
FIG. 7 is a bottom elevational view thereof.
The broken lines immediately adjacent the claim represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.