Layering is a common approach to tackling large problems in Computers. There are a few common ways of dividing responsibilities on the Internet. One of the most often used is the TCP/IP Five Layer Model. 1. Go online and read up on the TCP/IP Five Layer Model. In your own words write a brief description of the responsibilities of each layer. 2. Looking at the picture above: Host Computer 1 and 2 are on network A, while Host Computer 3 and 4 are on network B. The Router/Gateways in between represent other networks on the internet. If Host 1 is talking with Host 4 using VOIP or Chat, give an example of how each layer plays its part in the communication.

1. ask the user how many questions are in the quiz. 2. ask the user to enter the key (that is, the correct answers). there should be one answer for each question in the quiz, and each answer should be an integer. e.g., 34 7 13 100 81 3 9 10 321 12 might be the key for a 10-question quiz. you will need to store the key in an array. 3. ask the user to enter the answers for the quiz to be graded. there needs to be one answer for each question. note that these answers do not need to be stored; each answer can simply be compared to the key as it is entered. 4. when the user has entered all of the answers to be graded, print the number correct and the percent correct. 5. add a loop so that the user can grade any number of quizzes with a single key. after the results have been printed for each quiz, ask "grade another quiz? (y/n)." note: you only have one array (the key). you are not creating a new key for each set of quiz answers.