INFSCI_1071_MT_Spring09_Sols

INFSCI_1071_MT_Spring09_Sols - University of Pittsburgh...

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INFSCI 1071 Midterm Exam Spring 2009 Page 1 of 3 University of Pittsburgh Name: ………………………….………. INFSCI 1071: Applications of Networks Midterm Exam Spring 2009 Grade: / 100 Duration: 2h 30min Part 1. True/False questions (20 pts) 1. F 2. F (packets may take different paths with different MTUs) 3. T 4. T 5. F 6. T 7. T 8. F 9. F 10. T 11. F 12. T 13. F 14. F 15. F 16. F 17. T 18. F 20. F 21. T Part 2. Give short answers (1-2 lines) to the following questions (20 pts) 1. The IPv4 header has a field (called “protocol”) that would indicate to the receiving router that its payload is an IPv6 packet. 2. One cannot initiate a TCP connection to a host that is behind a NAT router. A peer A (that is not behind a NAT) can ask a peer B via a third peer C to initiate a TCP connection to it. Another solution that wors if both A and B are behind NATs is to use application relays (as used in Skype). 3. Essentially, because the node that has requested the new address does not have it yet. The Ack has to have a broadcast address to reach the client. Incidentally, it may be useful to let other DHCP servers know about this address allocation. Consider a network that has several DHCP servers. When several DHCP servers make offers to a
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INFSCI_1071_MT_Spring09_Sols - University of Pittsburgh...

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