Take home test questions portion of the final test for Network Security: 1. Suppose you are having a job interview, and the interviewer for the job looks over the transcript and sees you have taken a class on Network Security during the monsoon summer of 2004. The interviewer asks you the following: How will the Network Security class you took benefit our organization and help you be a better employee and contribute something extra as we do business (or education or provide services or marketing or sales) in the 21st century? Hint: The interviewer is looking for an extensive discussion that illustrates what you have learned, but also your creativity and passion and humor and ability to communicate some ideas that will help make the organization more effective because you are part of it. 2. What subnet mask should we assign for UNI if we want UNI to have about 1,500 different subnetworks that we can route to within the 134.161.y.z address domain? How many hosts can UNI have on EACH subnetwork? Draw a diagram and show the binary format of your subnet mask and circle bits and describe what it all means. Give the entire list of UNI possible subnetwork addresses ----------- that have 134.161.105.z as the first 3 octets. In other words, list ALL of the subnet addresses that have a 105 as the 3rd octet with the assumption that the UNI subnet mask allows the 1,500 subnets. Note: There are only a FEW subnets that have the 105 as the value of the 3rd octet! :-) ---------------------------------------------------------------------- 3. Why can't secret key cryptography offer the assurance of non-repudiation? Explain and give an example. 4. What are the four ways that BlackHat can attack digital certificates? 5. Draw a diagram or a series of diagrams and explain the process of Alice sending an email message to Bob using the PGP email system and how confidentiality, integrity, authentication and non-repudiatiion security needs are protected by the various phases or aspects of the PGP system. Turn in your answers under the door of Wright Hall 106, if I am not there when you stop. Turn them in by Thursday morning at 9 a.m. at the very latest. Have a great rest of the summer! Mark