MU Information Technology (Semester 6)
Distributed System
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Attempt the following.
1 (a) Compare Stateful and Stateless server implementations.
5 M
1 (b) Explain what is callback RPC.
5 M
1 (c) What are the challenges in SOA.
5 M
1 (d) List types of failures in message passing system and how to over come them.
5 M

2 (a) Explain key components of DCE.
10 M
2 (b) What is thread and advantages of using them. What are different models for organizing threads.
10 M

3 (a) Define Happened-Before relationship. Explain implementation of logical clocks with an example.
10 M
3 (b) Describe .NET architecture with neat labelled diagram.
10 M

4 (a) Explain various transparencies need to achieve in Distributed system.
10 M
4 (b) Explain Distributed Approach for providing mutual exclusion.
10 M

5 (a) Explain desirable features of a good message passing system.
10 M
5 (b) How is sequential consistency model implemented if Replicated Migration Blocks are used in distributed system for Distributed Shared Memory.
10 M

Write notes on following.
6 (a) COBRA Components.
5 M
6 (b) Components of EJB framework.
5 M
6 (c) Explain Message Buffering in IPC.
5 M
6 (d) Use of External Data Representation for Process Migration in Heterogeneous systems.
5 M



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