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How to block a PC on the network? [closed]

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linux-howto

http://serverfault.com – My friend is on a local network with his brother that always get some virus on his PC. Recently he got a virus called Conficker... So I was thinking if it is possible to block all access from his brother PC. How can she block the access from his brother PC to prevent any kind of virus getting into her PC? (HowTos)