DISTRIBUTED COMPUTING (DC) MAY 2010 COMPUTER SCIENCE SEMESTER 8

DISTRIBUTED COMPUTING (DC) MAY 2010 COMPUTER SCIENCE SEMESTER 8

Con.3232-10.                                                                                                AN-3148

                                                                (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.

1. (a) What is CORBA? Explain its general architecture. [10 Marks]
    (b) Explain RPC mechanism. Explain RPC semanticsin case of failure. [10 Marks]
 
2. (a) What are the different goals of distributed system? Explain how are these goals implemented
          in the distributed system. [10 Marks]
    (b) Compare NOS and DOS with suitable diagram. [10 Marks]

3. (a) What is totally ordered multicasting? How Lamport clock is implemented? [10 Marks]
    (b) Explain the need for co-ordinator in distributed system. Explain the election
          algorithm. [10 Marks]

4. (a) What are the various forms of message oriented communication? Give example of
          each. [10 Marks]
    (b) Explain attacks and security threats in distributed system. [10 Marks]

5. (a) Explain code migration and role of mobile agents. [10 Marks]
    (b) Explain the process of concurrency control using pessimistic and optimistic time stamp
         ordering. [10 Marks]   

6. (a) What is name resolution? Explain various ways of name resolution. [10 Marks]
    (b) Explain distributed algorithm for mutual exclusion. What are the advantages and the
         disadvantages of it over centralized algorithms. [10 Marks]  

7. Write short notes on:(any two):- [20 Marks]
     i) CODA file system
    ii) Fault Tolerance
   iii) Parameter passing in RMI
   iv) NFS file system.