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Everything here is gigabit (NICs, router and switch) except for two ethernet 10/100 network printers. Will attaching them to my switch slow the whole network down?

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Of course not. Why would it? Switch negotiate the speed with the device connected and if errors occur you can change the speed manually on the switch. – mnmnc Mar 30 '13 at 23:18
    
why would it? I read that "All devices on a network will auto-negotiate to a common sped to a void incompatibility bottleneck" and "IMHO unless you ar planning to pjase out all of the 10/100 mgabit nics on you network don't bother going to gigabit" forums.smallnetbuilder.com/showthread.php?t=312 and also ". One reader said that merely plugging a NIC running at 100 Mbps into a gigabit switch was enough to force all gigabit links to 100 Mbps speed" smallnetbuilder.com/content/view/30212/54 smallnetbuilder.com/content/view/30212/54 – Max Hodges Mar 31 '13 at 12:59

You should not have an issue. Point to point should switch to what the device supports. If you were on a token ring it would matter. Through a modern router or switch there should be no issue. Make sure your switch does not have some sort of force mode enabled too.

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is "force mode" like this "flow control" issue? smallnetbuilder.com/content/view/30212/54 – Max Hodges Mar 31 '13 at 13:01
    
interesting superuser.com/questions/346532/… – Max Hodges Mar 31 '13 at 14:09

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