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Anna University
Question paper
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2012
Eighth Semester
Computer Science and Engineering
CS 2056/CS 804- DISTRIBUTED SYSTEMS
(common to Information Technology)
(Regulation 2008)
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PART A-(10*2=20 marks)
1. What is the main objectives of distributed systems?
2. Define marshaling.
3. Differentiate static and dynamic invocation methods.
4. Define client stub and server stub.
5. What do you mean by name resolution?
6. What is the use closure mechanism?
7. What do you mean by clock skew and clock drift?
8. What are the disadvantage of multicast?
9. Differentiate lazy release and eager release consistency.
10. Write the definition for sequential consistency.
PART B-(5*16=80 marks)
11. (a) (i) State and explain the challenges of distributed systems.
(ii) Define the term distributed system.Explain with two examples.(10+6)
Or
(b) (i) Briefly explain group communication.
(ii) Explain how inter process communication is handled in UNIX.(10+6)
12. (a) Discuss the design and implementation issues in Remote Method Invocation.(16)
Or
(b) Describe the architecture for multi threaded servers.Discuss the issues related to thread progamming, thread lifetime, thread synchronization, scheduling and implementation.(16)
13.(a) What is name service?What are its goals? How it is implemented? What is directory service? (16)
Or
(b) (i) Name all modules of file system operations and write in detail about distributed file system requirements.
(ii) Discuss the mounting issues of remote file systems on NFS client.(8+8)
14.(a) (i) What is the goal of an election algorithm? Explain it detail. (8)
(ii) Explain how mutual exclusion is handled in distributed system. (8)
Or
(b) (i) Describe the internal and external synchronization of Physical clocks.(8)
(ii) Explain the Chandy and Lamports snapshot algorithm for determining the global states of distributed systems. (8)
15.(a) Contribute your comments on granularity and page replacement issues in the design of distributed shared memory systems. (16)
Or
(b) Explain the different consistency models for distributed. (16)
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