BD350 HW 2

Internet Addressing

Due: 2006 Sept 27, beginning of class

Name: ___________________________________

Score:  _____ / 45 = _____ / 100

Show all work for how you arrived at your answers.  You WILL NOT GET FULL CREDIT if you do not show work.  In other words, do not just use a calculator (or your hand, computer, web, etc.) and write down the answer.  You must show the work / process you followed that would be required to answer each question.

Assume IPv4 class-based routing for all IP questions.

Submit a printed set of answers (no e-mail).  Staple multiple sheets of paper together.  (Do not use paper clips, fold, tear, etc. to attempt to keep multiple sheets together.)

Internet addressing & routing

  1. (8 pts)  What class address space do the following IP numbers belong to?
    2.   If anything is (or could be) special about a given address, indicate what it is.
    1. 10.4.7.160
    2. 129.100.255.34
    3. 193.13.242.255
    4. 127.50.60.70
    5. 230.200.45.4
    6. 12.16.255.255
    7. 192.168.200.12
    8. 172.20.10.45
  1. Network numbers and number of usable hosts on a (sub)network.
    1. (3 pts)  Assume  you have an IP address of 14.25.216.14 and a netmask of 255.255.0.0.  What is this machine's number on the network and how many usable/actual hosts can exist on this network?  What is the "parent" network number?
    2. (3 pts)  Assume  you have an IP address of 60.141.22.190 and a netmask of 255.255.128.0.  What is this machine's number on the network and how many usable/actual hosts can exist on this network?  What is the "parent" network number?
    3. (3 pts)  Assume you have an IP address of 192.168.41.61 and its netmask of 255.255.255.128.  What is this machine's number on the network and how many usable/actual hosts can exist on this network?  What is the "parent" network number?
  1. (5 pts)  Assume a "parent" network of 190.15.64.0 and a netmask of 255.255.192.0.
  1. How many bits are available (within the parent network address space) for the network number?
  2. How many bits are available for the host number?
  3. How many actual hosts could be handled on one of these subnets?
  4. How many subnets of this size could be created within the "parent" network?
  5. List the actual network numbers for each of these subnets.
  1. Netmask.
    1. (6 pts)  Determine the most precise netmask that could be used in order to allow for a subnet of up to 30 machines.  Illustrate with an example.  (In other words, find the netmask, show how you would determine the answer, and then give as an example a valid parent network and child IP subnet number and the smallest and largest IP numbers that could be used for hosts on this subnet and the subnet's broadcast address.)
    2. (6 pts)  Determine the most precise netmask that could be used in order to allow for a subnet of up to 64 machines.  Illustrate with an example.  (In other words, find the netmask, show how you would determine the answer, and then give as an example a valid parent network and child IP subnet number and the smallest and largest IP numbers that could be used for hosts on this subnet and the subnet's broadcast address.)
  1. Routing process.
    2.   (Each of these will require about 1/4 - 1/3 of a page to describe.)
    1. (2 pt)  Describe the process that is followed if we are attempting to communicate from host 100.50.17.127 to 100.17.50.25 and the local machine’s netmask is 255.255.255.0 and its default gateway is 100.50.17.1.  Make sure you include all key components / processes along the way, and that your description is sequentially accurate.
    2. (2 pt)  Describe the process for the case where the destination machine is 100.50.17.65?
    3. (2 pt)  Describe the process for the case where the destination machine is 82.41.192.7?
  1. Assume that we have a network with machines 129.82.133.1, 129.82.133.45, 129.82.133.65, 129.82.133.100, 129.82.133.150, and 129.82.133.200.
    1. (1 pt)  If these machines are connected via a hub and we transmit from one of these machines to the other, how many of these machines see the packets?  (Give an exact number, and include the machine that initially sent the packet in your count, since it "sees" the packet too.)
    2. (1 pt)  What if these machines are connected via a switch?
  1. (2 pts)  Which of the following is a broadcast IP address?
    2.   (There may be more than one correct answer.)
    1. 255.255.255.255
    2. 129.82.133.255
    3. 129.82.FF.FF
    4. AB:CD:12:34:FF:FF
    5. FF:FF:FF:FF:FF:FF
  1. (1 pt)  Which of the following is a broadcast MAC address?
    2.   (There may be one or more correct answer.)
    1. 255.255.255.255
    2. 129.82.133.255
    3. 129.82.FF.FF
    4. AB:CD:12:34:FF:FF
    5. FF:FF:FF:FF:FF:FF