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Final Exam (Take Home) COSC 4436

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Final Exam (Take Home) COSC 4436 Start Time: 3:30 PM (3rd December 2016) End Time : 3:30 PM (5th December 2016) Please submit your paper at CMS in due time. If you have any issue with CMS submission then you can email me the paper but it has to be before the deadline 3:30 PM. Please note that, if you fail to submit the answer before the end time, you won’t get the grade for this final exam. Please attach (at the very first page of your answer paper) the consent form attached at the start of this question paper. Please note that, if required then I can request you to meet me to discuss yo...

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Final Exam (Take Home) COSC 4436 Start Time: 3:30 PM (3rd December 2016) End Time : 3:30 PM (5th December 2016) Please submit your paper at CMS in due time. If you have any issue with CMS submission then you can email me the paper but it has to be before the deadline 3:30 PM. Please note that, if you fail to submit the answer before the end time, you won’t get the grade for this final exam. Please attach (at the very first page of your answer paper) the consent form attached at the start of this question paper. Please note that, if required then I can request you to meet me to discuss your answers. Please note that this is a take home exam but the writing should be completely yours. You should not discuss it with your friends/classmates. If I find similarities between two papers, I will marked 0 for both papers. GOOD LUCK. CONSENT I (put your name here) declare that I myself wrote everything on this paper. I haven’t copied any part from any source and did not get any help from anyone else. Signature Date: Questions Total Marks: 100 1. [10 marks] Describe the caching for information centric networking (ICN)? Why typical page replacement algorithms for operating systems are not a good solution for the cache replacement in ICN? Hints: CacheReplacementICN.pdf 2. [12 marks] Describe value based cache replacement algorithm and its performance. Hints: CacheReplacementICN.pdf 3. [12 marks] Describe the advantages of having a local algorithm for the redundant reader elimination problems in RFID? Hints: CARRE_RFID.pdf 4. [10 marks] Explain NTE algorithm for the redundant reader elimination in RFID networks? Show an example where NTE performs worse than the classical set cover algorithm. Hints: RFID_NTE.pdf 5. [12 marks] Explain stable matching algorithm in details with an example. Hints: stableMatching.pdf is such an example. You can find any other example online, for example, residency matching for the medical education. You can have an idea from the online about it but you have to come up with your own example and explanation. 6. [8 marks] Describe any two routing algorithms for sensor networks in details? Explain the advantages and disadvantages of these two routing algorithms. Hints: surveyRouting.pdf 7. [20 marks] Consider Algoma University has bought a network IP address 173.15.0.0 (Class B). Now answer the following questions a) [3 marks] What is the default subnet mask for this address? b) [3 marks] What is the broadcast address of this network? c) [4 marks] How many computers (usable hosts) can be attached under this network? d) Consider Algoma University is considering to make some subnetworks. They are considering to provide 20 usable hosts to each sub-network. Now, answer the following questions e) How many usable subnetworks they can create considering the fact that each subnetworks will have 20 usable hosts. f) How many bits need to be borrowed to create such usable subnetworks? g) Write down the network address of first ten usable subnetworks. h) Write down the broadcast address of first ten usable subnetworks. i) Write down the IP addresses of the hosts of the first usable subnetwork. 8. [8 marks] A pure ALOHA network transmits 500-bit frames on a shared channel of 100 kbps. What is the requirement to make this frame collision-free? 9. [8 marks] Design the flow diagram for the CSMA/CD protocol when the back off timer (TB) is always increased twice of its current value. Consider the initial value as 1 ms.

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1. [10 marks] Describe the caching for information centric networking (ICN)? Why typical page replacement algorithms for operating systems are not a good solution for the cache replacement in ICN?

Solution:

ICN (Information centric networking) is a mechanism that focuses on the user’s content requests but ignoring the nature and location of the content’s host. In ICN architectural model, when any requests for contents arrives, it can serve two cases,-

  1. If  the requested data is cached, it directly sends.
  2. If the data is not cached, then requests are sent to the neighbor node supplier.

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