simple question

Question:

Kindly i need to ask ,WS-C3560X-24T-L  what does it mean by subnet zero at this phrase " The ip subnet zero command is not configured on a router "

Answer:

clear explanation with WS-C3560X-24T-S Price example.

http://www.packetu.com/2011/11/14/the-ip-subnet-zero-command/