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Cisco Package Tracer "Invalid IP for this subnet mask"

Last updated on December 25, 2018

        I'm using Cisco Package Tracer Student to test some networks. But I'm getting the error "Invalid IP for this subnet mask" when I try to set the IP of a PC as OR and the mask as, this network is supposed to be an /23 so the valid range should be from to 
If I set the PC's IP as it works, just as Why can't I use those I need?

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