Download AKTU B-Tech 7th Sem 2017-2018 ECS701 Distributed System Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 7th Semester (Seventh Semester) 2017-2018 ECS701 Distributed System Question Paper

Printed Pages: 02 Sub Code: ECS701
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B.TECH
(SEM. VII) THEORY EXAMINATION 2017-18
DISTRIBUTED SYSTEM
T ime.? 3H0urs Max. Marks: 100
Note: Attempt all Sections. Assume missing data, if any.
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1. Attempt all questions in brief. 10x2 = 20
a. Why would you design a system as a distributed system? List some advantages of distributed
systems.
b. List three properties of distributed systems.
0. What is the advantage if your server side processing uses threads instead of a single process?
(1. What is a proxy? Give an example of where a proxy can be used.
e. What are the differences between a local call and a remote call?
f. What is the purpose of a ?rewall?
g. What were the reasons that middleware moved from distributed objects to distributed
components?
h. Name two mechanisms that can be used to ensure performance in distributed systems.
i. What are the differences between a URL, URI and URN?
j. What is atomic commit protocol?
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2. Attempt any three of the following: 10 x 3 = 30
a. What is distributed transparency? Explain the different types of distributed
transparencies.
b. Explain shared memory architecture and distributed memory architecture.
0. Describe Byzantine agreement problem, and explain its solution. Show that Byzantine
agreement cannot always be reached among four processors if two processors are faulty.
(1. Discuss the major issue in designing a distributed system.
6. What is Mutual Exclusion? Describe the requirements of mutual exclusion in distributed
system. Is mutual exclusion problem more complex in distributed system than single
computer system? J ustify your answer.
SECTION C
3. Attempt any two parts of the following: 5 x 2 = 10
a. Draw a schematic diagram of the distributed transaction management model. Explain
each component in brief.
b. Describe three phase commit protocol. How three phase commit protocol is different
than two phase commit protocol?
c. Write and explain various issues that must be addressed in design and
implementation of distributed file system.
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4. Attempt any two parts of the following: 5 x 2 = 10
(a) What is Cache? Discuss read operation with cache and write operation with
cache.
(b) Explain naming in distributed system. What is ?at naming and structured
naming?
(c) Classify the Deadlock detection algorithms. Describe the Path?Pushing deadlock
detection algorithm.
5. Attempt any one part of the following: 10 x 1 = 10
(a) What are stub and skeleton and why are they needed in remote procedure calls?
(b) What is the purpose of an Interface Definition Language? Why does CORBA
not just use the J ava interface construct?
6. Attempt any one part of the following: 10 x 1 = 10
(a) How the distributed computing system is better than parallel processing system?
Explain.
(b) What is termination detection in distributed system? Explain any algorithm for
termination detection.
7. Attempt any one part of the following: 10 x 1 = 10
(a) How does a server know that one of his remote objects provided by him is no longer
used by clients and can be collected? How does J ava RMI handle this problem and
what alternatives are there?
(b) De-activation is a technology used to preserve server resources where a server
which provides remote objects to clients can de-activate those remote objects.
Clients should not know about this. What must the server do to avoid surprises for
the clients?
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