I lose internet connection every time my computer sleeps

HI, I lose internet connectivity everytime my laptop sleeps or shuts down. why? and how do I maintain connectivity with wireless router?

If you had mountain lion, you could've used a feature called power nap. It keeps networking on even when the mac is asleep.
On other OS, I guess its bound to disconnect all networks when it goes to sleep You can try an app called Caffeine that doesn't let it go to sleep.

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