Its a simple question, regarding the above task, in the solution the prefix is 18.104.22.168/18 but my solution was 22.214.171.124/20 both are working but why is he using the /18 prefix??
Is 24.X.56.0/24 subnet (between R5 and R6) in your range with mask /20? I don't think so...
There is actually a few more subnets which are not included.
With /20 mask the range on the third octet is 0-15 only. To cover all 24.x.y.y subnets we need range 0-63 => /18 mask
Ohh, I was not able to find this subnet in my routing table...let me check again
thanks a lot