AndreL wrote: » This will be my next exam after 290, my question is on how the answers will asked do they add +2 (as in leaving the address the same as 2^4=8 and not 2^4=8-2)on the subnet side and -2 on the host side. I think this is kinda complicated to read but the rfc 1812 allow for the 1s and 0s to be counted on the subnet or the network side of the ip address is there a rfc for the router seein the 1s and 0s on the host side of the IP addess.