2. ARIN (American Registry for Internet Numbers) is responsible for managing public IP space for most of North America as well as the Caribbean. Research and list the other four organizations that responsible for the rest of the world as well as the geographic region they serve. (This one will likely require some Internet research).

3. Change each of the following masks to a prefix length:

a. 255.224.0.0

b. 255.240.0.0

c. 255.255.255.128

4. Each of the following addresses belongs to a block. Find the first and the last address in each block.

14.12.72.8/24

b. 200.107.16.17/18

c. 70.110.19.17/16

5. Explain how DHCP can be used when the size of the block assigned to an organization is less than the number of hosts in the organization.

6. A large organization with a large block address (12.44.184.0/21) is split into one medium size company using the block address (12.44.184.0/22) and two small organizations. If the first small company uses the block (12.44.188.0/23), what is the remaining block that can be used by the second small company? Explain how the datagrams destined for the two small companies can be correctly routed to these companies if their address blocks still are part of the original company.

7. An ISP is granted the block 80.70.56.0/21. The ISP needs to allocate for two organizations each with 500 addresses, two organizations each with 250 addresses and three organizations each with 50 addresses.

Find the number and range of addresses in the ISP block.

Find the range of addresses for each organization and the range of unallocated addresses.

Show the outline of the address distribution and the forwarding table.