Jawaharlal Nehru Technological University Kakinada 2010-5th Sem M.C.A Subject Code: MC404 Iester [R06] Regular &Supplementary s, Distributed Operating Systems - Question Paper

Time: three Hours

Max Marks: 60


ans any 5 ques. All ques. carry EQUAL marks



1. a) elaborate the 2 synchronization primitives used by multiprocessor operating systems.
discuss briefly.

b) elaborate the design goals of distributed systems?

2. a) define how connection less communication ranging from a client and a server proceeds when
using sockets.

b) Compare connectionless (UDP) and connection oriented communication (TCP).

3. a) elaborate the 2 methods for implementing atomic transactions? discuss.

b) How is concurrency control done with pessimistic time stamp ordering?

4. a) elaborate the various classes of failures that occur in RPC systems? discuss in brief.

b) elaborate the various kinds of failures that occur in distributed systems? discuss.

5. a) elaborate the requirements of distributed file systems?

b) How does the NFS Automounter help to improve the performance and scalability of NFS?

6). a)Why should we want to implement page-based DSM largely at user-level, and what is
needed to achieve this?

b) What is meant by write invalidation? discuss.

7).Describe the subsequent client centric consistency models.

(a) Monotonic writes.

(b) learn your writes.

(c) Writes follow Reads.

8 .a) elaborate the design features of MACH?

b) What is a task? How is a new task created? explain the features related to the management
of tasks and the execution of their constituent threads.

Earning:   Approval pending.