DISTRIBUTED COMPUTING (DC) DECEMBER 2011 COMPUTER SCIENCE SEMESTER 8
Con.6740-11. (REVISED COURSE) MP-5188.
(3 Hours) [Total Marks :-100]
N.B:- (1) Question No.1 is compulsory.
(2) Attempt any four questions out of remaining six questions.
(3) Figures to the right indicate full marks.
(4) All questions carry equal marks.
1. (a) What are the major issues in designing a distributed operating system? [5 Marks]
(b) What are the main similarities and differences between the RPC Model and the ordinary
procedure call model? [5 Marks]
(c) What are the statefull and stateless servers? [5 Marks]
(d) Differentiate: Replication vs Caching. [5 Marks]
2. (a) Explain various forms of message-oriented communication with suitable example. [10 Marks]
(b) Compare processes and threads. Explain user and kernal level threads execution and also the
need of light-weight threads. [10 Marks]
3. (a) What are the different failure that can occur in RPC system? Discuss the solutions for these
failures. [10 Marks]
(b) Compare data centric and user centric consistencies and explain one consistency model of
each type. [10 Marks]
4. (a) Explain desirable features of a good naming system. [10 Marks]
(b) What is CORBA? Explain its architecture and various services provided by it. [10 Marks]
5. (a) Explain distributed algorithm for mutual exclusion. What are the advantages and
disadvantages of it over centralized algorithm? [10 Marks]
(b) Explain main issues in building a DSM system on a network of heterogeneous
machines. [10 Marks]
6. (a) Explain the process of synchronization w.r.t physical and logical clocks. [10 Marks]
(b) Explain lightweight RPC. [10 Marks]
7. Write short notes on any two: - [20 Marks]
(a) Fault Tolerance
(b) Attacks and Security in a Distributed System.
(c) Issues in Designing Load Sharing Algorithms.
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