Network loss when use sleep mode in windows 7

Dear Expert
I have problem about windows 7 as below,
when I use windows 7 Professional in Toshiba Notebook
1. A network being cut when it becomes the sleep mode.
2. Have to restart the Notebook to connect Network again.
I'm not sure that it is feature of Windows 7 or not?
Could you please to help me solve problem ?
Thank you

Hi,
Yes, clear "Allow the computer to turn off this device to save power" in the properties of network adapter\Power management as mentioned in the link provided by arnavsharma, and check if the issue persists.
Yolanda Zhu
TechNet Community Support

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Hi all.
Since I've installed Mountain Lion, any time the computer goes into sleep mode, networking do the same: I cannot download files, when the computer wakeup I have to wait the reconnection before being able to use mail, safari or ather network stuff.
I did not find any option to set, telling the computer waht to do when in sleep mode.
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