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2003 Course Distributed Systems

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Total No. of Questions :12] P1104 [Total No. of Pages : 2 [3864] - 412 B.E. (Computer Engineering) DISTRIBUTED SYSTEMS (2003 Course) (410451) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates: 1) Answer to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, mollier charts, electronic pocket calculator and steam table is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) What is the difference between distributed operating system and network operating system? [6] b) What is difference between vertical distribution and a horizontal distribution? [6] c) Explain degree of transparency with suitable example. [6] OR Q2) a) b) c) Explain different types of system models in a Distributed System. [6] Enlist and explain different middleware models. [6] Explain different transparencies in distributed system with suitable examples. [6] Q3) a) Explain different forms of communication in message oriented communication. [8] What are the issues concerned with parameter passing in RPC system?[8] OR b) Q4) a) b) Explain token bucket algorithm with respect to quality of service requirements. [8] Explain general architecture for message queuing system for persistent communication. [8] P.T.O. Q5) a) b) Q6) a) b) c) Q7) a) Compare Coda and xFS distributed file system. [8] What is X.500? Describe the organization of X.500 name space. [8] OR Explain principle of log based striping in xFS with neat diagram. [6] Explain how DNS can be used to implement a home based approach to locating mobile users. [6] Explain difference between iterative and recursive name resolution. [4] SECTION - II To achieve totally-ordered multicasting with Lamport timestamps, is it necessary that each message is acknowledged? Explain. [6] b) Explain Berkeley algorithm for clock synchronization with suitable example. [6] c) Explain how NTP (network time protocol) is useful to distribute time over the Internet, also state the features of NTP. [6] OR Q8) a) b) Q9) a) b) Explain the difference between nested transactions and distributed transactions. [8] Explain Bully and Ring election algorithms. Discuss time complexity for [10] both algorithms in best case and worst case. Enlist and discuss different failure models. [8] Explain different techniques to achieve reliable group communication. [8] OR Q10)a) Explain n-army problem with possible solution. [8] b) What are different classes of failures that can occur in RPC system? Explain with suitable example. [8] Q11)a) b) Explain the elements of GRID computing systems. [8] How does Portable Object Adapter use a servant to build image of CORBA object? [8] OR Q12)a) b) What is virtual organization concept in GRID? [8] Explain the importance of CORBA IDL, CORBA RMI service and CORBA Naming Service. [8] [3864]-412 jjj 2

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