Problem 1:
Network Address: 172.25.0.0
Requirement: Need 600 hosts per subnet
Solution:
Subnet Mask needed: 255.255.252.0
Reason: :252 in the third octet leaves 10 bits
for the hosts or 1022 hosts per subnet. 255.255.248.0 would
have been more hosts than we needed and 255.255.254.0 would not have
been enough hosts. 
Problem 2:
Network Address: 172.25.0.0
Requirement: Need 8 subnets with the greatest number of hosts possible per subnet
Solution:
Subnet Mask needed: 255.255.240.0
Reason: 255.255.240.0 will give you 14 subnets. 255.255.224.0 will not be enough subnets and 255.255.248.0 will not provide the maximum number of hosts per subnet.

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