Download GTU BE/B.Tech 2018 Winter 8th Sem Old 180701 Distributed Systems Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (OLD) EXAMINATION — WINTER 2018

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Subject Code: 180701 Date: 19/11/2018
Subject Name: Distributed Systems
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) What is a distributed system? How a distributed system does projects a single system image? Discuss the design issues of distributed system.
(b) Explain any two protocols of distributed systems.
Q.2 (a) Explain IPC synchronization techniques in distributed systems.

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(b) Write a note on RPC.
OR
(b) Write a note on RML
Q.3 (a) Assign the clock timing according to Lamport’s logical clock.
(b) Write a note on Vector clock and enlist the advantages of it in comparison of Lamport’s logical clock.

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OR
Q.3 (a) Define thrashing in DSM. Also explain methods for solving thrashing problem in DSM.
(b) How problem is specified using formal model? Explain asynchronous point to point message passing and asynchronous broadcast.
Q.4 (a) Explain any two techniques of load balancing in distributed systems.
(b) Write a note on Process migration.

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OR
Q.4 (a) Discuss thread synchronization.
(b) What is consistency? Discuss the various consistency models used in DSM system.
Q.5 (a) What is coherence protocol? Explain how the MRMW protocol is implemented.
(b) Explain ways of naming of a file in distributed systems.

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OR
Q.5 (a) Explain the common approaches to user authentication. What problems are associated with these approaches?
(b) How does DFS differ from a file system used for a centralized time-sharing system?