Computer networks - IPv4 Addressing and Subnetting

11. [5 pts.] A network administrator is given the IP address block where one of the addresses is: 20.2.3.64.

a.

If classful addressing were used, what would be the class of this address?

What is its subnet mask in dotteddecimal notation?

How many valid host addresses would this block have?

b.

If classless addressing were used with /27, what would be the class of this address?

What is its subnet mask in dotted-decimal notation?

How many valid host addresses are available in this subnet?

What is the address of the first valid host address?

c.

If the subnet in b. is to be further divided into two subnets, what would be the last valid host address in the second subnet?