On the CCNA test I given an ip range of 172.16.1.50 - 172.16.1.59 from an ISP the netmask information was not supplied). Can you determine the prefix by adding up the number of IP addresses, and finding what VLSM block size they fit into (172.16.1.50/28) for purposes of creating an IP Nat pool (172.16.1.50 0.0.0.15) or must you use the classful mask (255.255.255.0) I played with this for a long period of time and concluded that you can only use VLSM is if both in the 4TH octet are divisible by 4. How is it possible to configure a IP Nat pool based only on the address range??
I need help