Hi Rene,
When find the wildcard mask for the Even subnet you mentioned:
'The first two octets are the same for all the subnets so we use all zeroes for the wildcard mask. In the third octet we use a 1 (don’t care) for all bits except for the 8th bit…it has to match. ’
Use 1 for all bits except the 8th bit (which is 0) will produce 1111 1110 which gives you a wildcard mask of 0.0.254.255.
Why is it that (except the 8th bit) doesn’t apply to Uneven subnet where the 8th bit is 1? As Uneven subnet also uses wildcard mask of 0.0.254.255,