Download JNTUH MCA 4th Sem R15 2019 April-May 824AF Distributed Systems Question Paper

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Code No: 824AF

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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MCA IV Semester Examinations, April/May - 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 design requirements for distributed architectures? [5]
2. b) What is the need for thread synchronization? Discuss briefly. [5]
3. c) Explain briefly about Routing overlays. [5]

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4. d) What are the advantages and drawbacks of multi version timestamp ordering in comparison with ordinary timestamp ordering? [5]
5. e) Give a brief note on the features and advantages of Kerberos. [5]

PART -B

5 x 10 Marks =50

1. Discuss about system models for distributed systems. [10]

   OR

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2. Explain how communication between distributed objects is achieved by means of RMI? [10]
3. Discuss about architecture and principals of monolithic Kernel and micro Kernel architectures. [10]

   OR

4. Discuss about X.500 Directory Service. [10]

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5. Explain Cristian’s algorithm and Berkeley algorithm for synchronizing clocks. [10]

   OR

6. Explain the algorithm for mutual exclusion in a distributed system. [10]
7. Explain any one optimistic concurrency control algorithm with relevant example. [10]

   OR

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8. Explain about Atomic commit protocols. [10]
9. Explain in detail about public — key cryptographic algorithms. [10]

   OR

10. Discuss about design and implementation issues in DSM. [10]

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