In the real world, each wireless device has a range upto which it can provide wireless connectivity. Packet Tracer simulates this range with the use of physical workspaces. We can see what happens when a laptop with a wireless interface is moved out of wireless range. For this exercise, we'll use the following topology:
This topology has a wireless access point (Access Point0) connected to a switch (Switch0), which is connected to a PC (PC0). We also have a laptop with a wireless interface.
Configure IP addresses on both the PC and laptop; we'll use IP addresses
10.0.0.2 respectively. Now ping ...