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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 10.1.1.255 OR 10.1.2.0 and the mask as 255.255.254.0, this network is supposed to be an /23 so the valid range should be from 10.1.1.1 to 10.1.2.254. 
If I set the PC's IP as 10.1.0.255/23 it works, just as 10.1.1.0/23. Why can't I use those I need?

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