Question 1:

An ISP is granted the block 154.27.10.0/20. The ISP

needs to distribute these addresses to two groups of

customers as follows:

a) The first group has 64 customers; each needs 32

addresses

b) The second group has 32 customers; each needs

256 addresses

Design the subblocks?

Question 2:

In a block of addresses, we know the IP address of

one host is 112.38.57.14 and the Mask is

255.255.240.0

a) Give the slash notation of the Mask

b) What is the first address ?

c) What is the last address in this block?

Question 3:

Give the mask in slash notation (CIDR) if the number

of addresses is 256?