192.168.20.0 / 24
192.168.20.0 / 26
192.168.20.64 / 26
192.168.20.128 / 26
192.168.20.192 / 26
To aswer these questions we need to look at Binary again
1100 0000 . 1010 1000 . 0001 0100 . 0000 0000
1111 1111 . 1111 1111 . 1111 1111 . 0000 0000
. 0100 0000
. 1000 0000
. 1100 0000
I was given 256 addresses with a /24. By borrowing the first 2 bits I can turn a single /24 into 4 /26 networks
. 0100 0000
. 0000 0000
. 1000 0000
. 1100 0000