A new department has been established with 405 hosts that require addresses. Currently the company uses the 20.10.0.0/19 address space. How many bits must the network administrator borrow to provide addresses for this subnet without wasting addresses? b) Consider an Internet address of the form 12.42.184.0/20. What does the /20 signify?
(a):
Given IP address id 20.10.0.0/19.
In order to get a subnet of size 405, the network administrator must borrow 4 bits from host bits inorder to reduce the wastage of IP's.
Reason:
Given no.of network bits are 19, so no.of host bits are 13
With that we will have 213 hosts per network.
But we require only 405 hosts, for that we fix that hosts bits be 9 because 29 = 512 < 405.
So, among 13 bits, 9 are given to host bits and remaining 4 bits are given to network bits.
So 4 bits must the network administrator borrow to provide addresses for this subnet without wasting addresses
(b):
In the given IP address 12.42.184.0/20, /20 signifies to no.of network bits in IP address.
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