For a class B network we have a total of 32 bits in the dormain of these 16 are used for Host ID and the other 16 for network ID. In order to create 50 subnets we need to alter the numbers in the network ID. Since latering on bit gives you 2 subnets we need to alter 6 bits to 64 bits since 5 will give you only 32.
Number 2
With 64 subnets yet we need only 50 . 64-50 =14
2^14= 16384 subnets but 50 are already used thus we have 16384-50 = 16334 unique unused subnets.
Number 3
The new subnet mask starts with 172.20.0.0/24,Hence the first subnet mask will be 172.0.0.0,Second one will be 172.20.1.0 and so on till 24.
Number 5
Classless Inter-Domain Routing, or CIDR, was developed as an alternative to traditional subnetting.The idea is that you can add a specification in the IP address itself as to the number of significant bits that make up the routing or networking portion.172.20.0.0/24 is the CIDR notation for this above created network.
Number 6
Thus the broadcast address of the subnet for the host at 172.20.6.139 is 172.20.6.255
Number 7
Since the value for host 172.20.11.250(11) specifies that it belongs to subnet 172.20.11.0 and 172.20.6.255(6) specifies that it belongs to subnet 172.20.6.0.
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