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2003 Course Distributed Systems

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Total No. of Questions : 12] P960 [Total No. of Pages : 2 [3664]-357 B.E. - (I.T.) DISTRIBUTED SYSTEMS (2003 Course) (414449) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) Answer 3 questions from Section I and 3 questions from Section II. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Assume suitable data, if necessary. Figures to the right indicate full marks. SECTION - I Q1) a) What is transparency? State different forms of transparencies. b) Explain fundamental models. [9] [9] OR Q2) a) Explain the issue of scalability. b) What is HTTP? Explain its main features. [9] [9] Q3) a) Explain any four RMI Call Semantics. [8] b) What is Asynchronous RPC? Draw necessary diagrams. [8] OR Q4) a) Explain how RMI is implemented in Java. b) Explain Events and Notifications. [8] [8] Q5) Write a note on : a) NFS file system. [8] b) Record Types in DNS. [8] OR Q6) Write a note on : a) Plan 9. [8] b) xFS. [8] P.T.O. SECTION - II Q7) Write a note on : [18] a) Bully Algorithm. b) Distributed Algorithm for mutual exlusion. c) Berkeley algorithm. OR Q8) a) What are locks? What is 2-phase locking? b) Explain Lamport Timestamps with Happened Before relationship. Q9) a) How are replicated writes handles? b) What are orphan calls? How are they handled? [9] [9] [8] [8] OR Q10) Why is 1-phase commit protocol not suitable for distributed transactions? What is 2-phase commit? What is 3-phase commit? [16] Q11) a) What are the services offered by CORBA? b) How does CORBA implement caching and replication? [8] [8] OR Q12) a) Explain general organization of CORBA. [8] b) Discuss how CORBA supports naming. [8] [3664]-357 2

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