Suppose an ISP owns the block of addresses of the form 128.129.80.128/26.
Suppose the block of address is a subnet. which of the following is its subnet mask?
Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. What are the prefixes (of form a.b.c.d/x, such as 128.129.80.128/26) for the four subnets?