Download JNTUH MCA 4th Sem R15 2017 August 824AF Distributed Systems Question Paper

Download JNTUH (Jawaharlal nehru technological university) MCA (Master of Computer Applications) 4th Sem (Fourth Semester) Regulation-R15 2017 August 824AF Distributed Systems Previous Question Paper

R15

Code No: 824AF













JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

MCA IV Semester Examinations, August - 2017

DISTRIBUTED SYSTEMS

Time: 3hrs













Max.Marks:75

Note: This question paper contains two parts A and B.

Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B
consists of 5 Units. Answer any one full question from each unit. Each question carries
10 marks and may have a, b, c as sub questions.



PART - A



















5 ? 5 Marks = 25




1.a) Differentiate between tightly coupled and loosely coupled systems.



[5]

b) What are the design goals of SUN network file system? Discuss.



[5]

c) How mutual exclusion is done in distributed systems? Give example.



[5]

d) What are the necessary conditions for a deadlock to occur in distributed systems?
























[5]

e) What is the difference between sequential and release consistency? Explain.

[5]



PART - B

















5 ? 10 Marks = 50

2.

Characterize distributed systems and explain different architectural models of distributed
systems.



















[10]

OR

3.

Explain how Inter Process Communication is achieved in distributed systems.

[10]



4.

Draw and explain the architecture for multi threaded servers. Discuss the issues related to
thread programming, thread lifetime, thread synchronization, scheduling and
implementation.

















[10]

OR

5.

Explain the case studies of Global Name Service and X.500 directory service.

[10]


6.

Describe the internal and external synchronization of physical clocks. Give an example
execution of a ring based algorithm to show that the processes are not necessarily granted
entry to critical section.















[10]

OR

7.

Explain the case studies of Squirrel and Ocean Store in detail.





[10]



8.

How concurrency control is attained in distributed systems? Make a comparison of
methods of concurrency control in distributed systems.







[10]

OR

9.

What is meant by fault tolerant services? Explain how primary backup model of
replication is fault tolerant.













[10]


10.

Write a detailed note on the case study of CORBA. Also discuss about CORBA RMI and
CORBA Services.

















[10]

OR

11.

What is distributed shared memory? Explain about page based shared memory system in
detail.



















[10]

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