Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad MCA 2017 DISTRIBUTED SYSTEMS Previous Question Paper (August - 2017 - R15)
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
Differentiate between tightly coupled and loosely coupled systems.
Answer
Tightly coupled systems consist of processors that share a common physical memory and a single clock, managed by a single operating system. They are characterized by high-speed communication and are typically used for parallel processing. In contrast, loosely coupled systems consist of autonomous computers connected via a network, where each machine has its own local memory and operating system. Communication occurs through message passing, making them more scalable but generally slower in inter-processor data exchange.
What are the design goals of SUN network file system? Discuss.
Answer
The primary design goals of the SUN Network File System (NFS) include:
- Transparency: Users and applications access remote files as if they were local, hiding the network complexity.
- Heterogeneity: It is designed to operate across different operating systems and hardware architectures.
- Fault Tolerance: NFS uses a stateless server design, meaning the server does not track client states, allowing for quick recovery after a crash.
- Performance: It employs caching mechanisms on the client side to reduce network traffic and improve access speeds.
How mutual exclusion is done in distributed systems? Give example.
Answer
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What are the necessary conditions for a deadlock to occur in distributed systems?
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What is the difference between sequential and release consistency? Explain.
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Part B
Characterize distributed systems and explain different architectural models of distributed systems.
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Explain how Inter Process Communication is achieved in distributed systems.
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Draw and explain the architecture for multi threaded servers. Discuss the issues related to thread programming, thread lifetime, thread synchronization, scheduling and implementation.
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Explain the case studies of Global Name Service and X.500 directory service.
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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.
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Explain the case studies of Squirrel and Ocean Store in detail.
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How concurrency control is attained in distributed systems? Make a comparison of methods of concurrency control in distributed systems.
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What is meant by fault tolerant services? Explain how primary backup model of replication is fault tolerant.
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Write a detailed note on the case study of CORBA. Also discuss about CORBA RMI and CORBA Services.
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What is distributed shared memory? Explain about page based shared memory system in detail.
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