You are the Network Administrator for a startup company that has been granted a new block of addresses starting with the address 139.145.56.0/22.
a) Calculate the total number of addresses available in this block including all the special addresses. Show your calculation
b) As Network Administrator, you need to distribute the available addresses n a departmental needs basis (meaning not allocating more than you have to), with 4 new subnets determined as follows:
Marketing needs 65 addresses Accounting need 100 addresses Head Office needs 33 addresses and, Customer Services needs 13 addresses.
Create the 4 subnets. For each subnet, list the subnet or first address, the last address, and the subnet mask in CIDR format. Show your calculations for all subnets, briefly showing how you arrived at the sub-block addresses.
c) How many addresses are left unallocated? Show your calculation.