Download JNTUH MCA 4th Sem R15 2019 December 824AF Distributed Systems Question Paper

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Code No: 824AF R15

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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MCA IV Semester Examinations, December - 2019

DISTRIBUTED SYSTEMS

Time: 3hrs Max.Marks:75

Note: This question paper contains two parts A and B.

Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.

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PART - A

5 x 5 Marks =25

1. a) What are the advantages and disadvantages of distributed systems? [5]
2. b) What is Domain Name System? Give examples. [5]
3. c) Discuss about Napster and its legacy. [5]

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4. d) Differentiate between flat and nested distributed transactions. [5]
5. e) Explain about Kerberos and TLS. [5]

PART -B

5 x 10 Marks =50

1. How distributed systems are characterized? Give examples of distributed systems and their challenges. [10]

   OR

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2. What is RPC? Write the features of RPC and explain how RPC is used in UNIX system. [10]
3. What is Distributed File System? Explain about Distributed file system implementation. [10]

   OR

4. Discuss about the case study of SUN Network file system. [10]

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5. What is Clock Synchronization? Write about Berkley algorithm. [10]

   OR

6. What is the significance of mutual exclusion in distributed systems? Distinguish between token-based solutions non-token based counterparts to distributed mutual exclusion.[10]
7. What is group communication? Explain the design issues and categories of group communication in detail. [10]

   OR

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8. Explain how deadlocks occur in distributed systems. Discuss their preventive methods. [10]
9. Differentiate between page based and shared variable Distributed Shared Memories. [10]

   OR

10. Explain consistency models and make a comparison between release and entry consistency models. [10]

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