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Network security with foreign network cards

Can a network interface card (NIC) from another network enter my network without my knowledge?

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This all depends on the configuration of your network gear. Many devices allow MAC address filtering. With MAC addressing filtering in place you can restrict devices on your network to only those with allowed or approved MAC addresses. With this kind of port security in place you can strengthen the security of your network.

This was first published in October 2010

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