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Most likely the problem is an IP conflict as others have mentioned, but there is a very far-out possibility of a MAC address conflict if any of the MAC addresses were manually (purposely) changed in the past. This happened when I made a friend's MAC address the same as my currently turned off laptop so he could use the school's resnet for 5 minutes without registering. A couple month's later when I was living with him and very strange network issues started happening, I realized the error of my ways.
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~Matt
CCNA
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