Networking case-projects 6

Case Project 6-1

As the network administrator for a growing ISP, you want to make efficient use of your network addresses. One of the network addresses IANA assigned to you is a Class C network of You have decided to use the addresses in this Class C network to satisfy the IP address requirements of 16 corporate customers who need between 10 and 14 addresses each. Calculate a subnet mask that meets their needs. List the subnet mask and the first four subnet addresses the mask will create.

  • IP
  • subnet
  • first 4 host addresses,,,
  • /20 ( is 16 addresses with 14 usable IP addresses each. Every corporate customer will be able to have their own /20 starting with 197.14.88 and all ip addresses in that range will be used – none wasted.


Case Project 6-2

You’re the head network administrator for a large manufacturing enterprise that’s completing its support for IPv6. The company has six major locations with network administrators and several thousand users in each location. You’re using a base IPv6 address of 2001:DB8:FAB/48 and want network administrators to be able to subnet their networks however they see fit. You also want to maintain a reserve of address spaces for a possible 6 to 10 additional locations in the future. Each network administrator should be able to construct at least 200 subnets from the addresses you supply, and each location should have the same amount of available address space. What IPv6 addresses should you assign to each location? When constructing your answer, list each location as Location 1, Location 2, and so forth.

  • Location 1 – 2001:DB8:FAB:0000
  • Location 2 – 2001:DB8:FAB:0200
  • Location 3 – 2001:DB9:FAB:0400
  • Location 4 – 2001:DB9:FAB:0600
  • Location 5 – 2001:DB9:FAB:0800
  • Location 6 – 2001:DB9:FAB:1000
  • Reserve 1 – 2001:DB9:FAB:1200
  • Reserve 2 – 2001:DB9:FAB:1400
  • Reserve 3 – 2001:DB9:FAB:1600
  • Reserve 4 – 2001:DB9:FAB:1800
  • Reserve 5 – 2001:DB9:FAB:2000
  • Reserve 6 – 2001:DB9:FAB:2200
  • Reserve 7 – 2001:DB9:FAB:2400
  • Reserve 8 – 2001:DB9:FAB:2600
  • Reserve 9 – 2001:DB9:FAB:2800
  • Reserve 10 – 2001:DB9:FAB:3000


Case Project 6-3

You must install 125 computers for a new business that wants to run TCP/IP and have access to the Internet. The ISP in town will assign you only four public IP addresses, so you decide to assign the computers addresses in the range through What else must you do to allow these computers to access the Internet?

                That’s a lot of computers to have statically assigned, but if they must be then DNS and gateway must also be set up as well on each individual computer. If it’s DHCP then they should be fine as long as they can make a connection to the router and not get a 169. address. Also, the firewall would have to be configured to allow that private IP to access the internet. There might be other layer 1 and 2 necessities depending on where the computers are located. For sure, switches would be needed because there aren’t any firewalls that can physically accept Ethernet connections from that many different computers. Ethernet cables would have to be run or possibly wireless access points set up if they are wireless.