Hall Ticket No Question Paper Code: BCS004
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
M.Tech II Semester End Examinations (Supplementary) January, 2019
Regulation: IARE-R16
DISTRIBUTED OPERATED SYSTEM
(Computer Science and Engineering)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Explain the grid and hypercube topologies of Switched Multicomputers.
Describe the concept of client server model.
2. Using parameter passing technique, explain the procedure to compute the sum(4, remotely.

Draw the Open Systems Interconnection reference model and explain in detail.
UNIT II
3. Describe the purpose of Election algorithm in distributed systems and exusing a ring.
Explain how mutual exclusion can be implemented in distributed systems using distributed algorithm.

4. Compare the wait-die deadlock prevention algorithm and the wound-wait deadlock prevention
algorithm.
Explain how clock synchronization is achieved in Berkeley UNIX.
UNIT III
5. Discuss the four ways of disk usage of work station model in distributed operating system.[7M]
Write the scheduling algorithm in distributed system with example.
6. Discuss the four ways of disk usage of work station model in distributed operating system.[7M]
Compare distributed file system and trends in distributed file system.
UNIT IV
7. Discuss the Ring-Based Multiprocessors concept for distributed shared memory conflicts. Give
any two differences with bus based multiprocessors.
Explain the page based distributed shared memory with example
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8. What is PRAM consistency. Consider the following code for three processes that run in parallel
on three different processors.
a=1 b=1 c1
printf(b,c) print(a,c) print(a,b)

Write Statement execution as seen by three processes.
Write the shared variables in distributed systems in detail.
UNIT V
9. Discuss about UNIX emulation implementation of threads in MACH.
Draw and explain the abstract model for UNIX emulation using Mach.
10. Draw the structure of Mach process and discuss its functionality.
Explain the UNIX emulation in MACH with example.