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Is it possible to deny or prevent or obstruct a network scan on the network where your computer is connected to?

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when you say network scanned what do you mean just not being able to be pinged? –  ben950 Jan 11 '12 at 9:37
    
@ben950, meaning that your computer will be able to avoid the scanning and that include any communication such as ping. –  Jack Jan 27 '12 at 7:35

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If you don't want your pc to be scanned for open ports or available services, you can use a firewall that closes/stealths the necessary ports. Beware, certain ports wil always be open to be able to communicate with the network.

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