CS 3251 Exam 1 Name Instructor Dr Clark March 1 2005 CS 3251 Spring 2005 Midterm Exam Problem Possible Score 1 20 2 15 3 16 4 17 5 16 6 16 Total 100 This test is closed book and closed notes Answer the questions in the space provided When answering questions please state any and all assumptions you are making 1 CS 3251 Exam 1 Name Part 1 Protocol Layering 20 points List in order the five protocol layers we discussed For each layer provide the following 4 things 1 Name of the layer 2 Service s provided by this layer to the upper layer 3 A specific standard protocol that fits in this layer 4 Where on which devices this layer is implemented 2 CS 3251 Exam 1 Name Part 2 IP 15 points 1 5 pts Why does IPv4 do fragmentation and reassembly 2 5 pts Where is fragment reassembly done in IP and why 3 5 pts How is fragmentation handled in IPv6 and why 3 CS 3251 Exam 1 Name Part 3 Network Programming 16 points 1 8 pts We discussed the notion of whether our protocols preserve message boundaries What is meant by this How does it affect network application programming 2 8 pts When running an application you receive the error message bind failed address already in use Is this a client a server or either Is this application using TCP UDP or either What does the error mean Explain your answers for full credit 4 CS 3251 Exam 1 Name Part 4 Routing 17 points 1 6 pts How do link state routing protocols build a network map without already knowing the network 2 6 pts What is the count to infinity problem and how is it handled avoided 3 5 pts What is meant by the term domain based routing 5 CS 3251 Exam 1 Name Part 5 Transition and Ping 16 points 1 8 pts IPv6 was standardized in 1998 and we still have very few deployments 802 11g was standardized in 2003 and it s deployed everywhere You can buy it at Wal Mart First what are these protocols and how do they differ Second explain why the deployment situation is this way 2 8 pts I can query a web server with my browser but when I ping the server I get no response How can this happen I m looking for the details on how ping works that might explain this 6 CS 3251 Exam 1 Name Part 6 Mobility and Addressing 16 points 1 8 pts I m sitting at home with my laptop connected to the Internet With basic IPv4 why is it not possible to use my Georgia Tech IP address from my office while I am connected from home Describe in detail what would happen if I did 2 8 pts What is CIDR Explain what it means what problem it solves and how 7