1. One of Facebook's IPv4 blocks is a 31.13.64.0/18. How many IP addresses does this block of addresses have?

2. Suppose Facebook uses a /24 subnet mask on a /18 network. How many subnets does this allow?

3. Suppose Facebook sets eight bits aside for hosts. How many IP addresses is this per subnet?

4. Suppose 98.10.72.181 is on a network with a /24 subnet prefix and a subnet field just large enough to support 128 subnets. What is the corresponding network prefix, with the mask in slash length (CIDR) format?

5. What are the subnet addresses of the following subnets within the above Facebook block? Recall that the subnet address is the lowest address in the subnet, i.e., the address with host bits set to zero. Each of the following numbers is the subnet number, i.e., the value in the address subnet field.

a. 26

b. 50

c. 38

d. 17

e. 22

6. For each of the following destination addresses, provide the address of the subnet within the above Facebook /18 block that it will be forwarded to. Each answer is a subnet address, which will be the destination address after the subnet mask is applied.

a. 31.13.96.216

b. 31.13.117.168

c. 31.13.9.139

d. 31.13.127.116