RTU 2016 Question Paper Semester VIII Computer Science and Engineering Distributed Systems

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t-r{ B.Tech. VIII Semester (Main) f,xamination, April/May 2016
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Computer Science & Engineering
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€ 8CS3A Distributed Systems

Time : 3 Hours Maximum Marks : 80
Min. Passing Marks : 24

Instructions to Candidates:
Attempt any five questions. selecting one qtrcstion
from each unit. All questions
carry equal m,arks. (Schematic diagrawts inust be shown wherever necessary.
Any data you feet missing suitably be assumed and stated clearly)
(Jnits of quantilies used/culctilared musr
be s;tatetl clearly.

Unit - I

1' a) What is distributed system? Explain its features differentiate between network.,
OS and distributed OS (8)

b) Differentiate between logical clock and global clock. Explain Lamport,s logical
clock algorithm (8)

OR

1. a) Define system model and briefly explain about architecture models (8)

b) What do you mean by distributed computing environment(DCE)? Explain its,
features services and goals (8)

Unit - II

2. a) What is RPC in distributed systems? Explain the client /server architecture.
Describe the role of client stub and server stub while making an RpC call(8)

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b) Describe the design issues and implementation of RMI (s)

OR

2. a) Describe the language mechanism for synchroni zation (8)

b) Explain the name and directory services (8)

Unit - ilI

3. a) Describe the file service architecture. Explain case study on sun network file
(8)

b), Differentiate between flat and nested distributed transaction. Explain
concurrency control in distributed transaction (8) \+/

OR

3. a) What is static process scheduling? Write the advantages of static process
scheduling (8)

b) Define time stamp ordering in transaction and explain with suitable example
(s)

Unit - IV

4. a) Explain distributed shared memory system in distributed environment with
suitable diagram (8)

b) Explain the failures in a distributed system (8)

OR

lo\ Explain distributed mutual ex cl u sion wi th its cl assi fi cati on (8)

b) Describe memory consistency.models & multiprocessor cache systems (8)

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Unit - V

S. a) Explain Byzantine agreement problem and suggest a solution to this problem(S)
b) Explain concept of fault, failure and recovery (8)
..:.

5. Write short note on the following

b) Atomic multicast

d) CORBA RMI (4x4:16)

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