STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Describe architecture model of Distributed System design. How these models play important role in the design of a distributed system?
9 M
1 (b)
Discuss different challenges in designing distributed system.
9 M
2 (a)
Describe the working of distributed system based upon middleware software systems. Also clearly describe the roles played by middleware in distributed system.
9 M
2 (b)
What is a failure model? Explain different failures in detail.
9 M
Answer any one question from Q3 and Q4
3 (a)
What is a Remote Method Invocation? How would you incorporate persistent asychronous communication into model of communication based on RMIs to remote object?
8 M
3 (b)
What is socket? What is the difference between connection-oriented socket and connection -less socket?
8 M
4 (a)
What is CORBA? Describe the general organization of CORBA system with help of a neat diagram.
8 M
4 (b)
Compare local method invocation and remote method invocation. Explain the role of proxy and skeleton in remote method invocation in detail.
8 M
Answer any one question from Q5 and Q6
5 (a)
Explain the concept of logic clock and their importance in distributed system. A clock of a computer system must never run backward. Explain how this issue can be handled in an implementation.
8 M
5 (b)
Explain Ricart and Agrawala's algorithm for mutual exclusion in detail.
8 M
6 (a)
Suppose that the coordinator crashes. Does this always bring the system down? If not, under what a circumstance does this happened? Is there any way to avoid the problem and tolerate the crash of the coordinator?
8 M
6 (b)
Define global state. Explain consistent cut and inconsistent cut with suitable example.
8 M
Answer any one question from Q7 and Q8
7 (a)
How does the NFS Automounter help to improve the performance and scalability of NFS?
9 M
7 (b)
Write a short note on:
i) Global name service
ii) X.500 directory service
i) Global name service
ii) X.500 directory service
9 M
8 (a)
Explain following term with respect to Naming entities:
i) Names
ii) Identifiers
iii) Addresses
iv) Name Spaces
i) Names
ii) Identifiers
iii) Addresses
iv) Name Spaces
9 M
8 (b)
Explain synchronization and naming in NFS.
9 M
Answer any one question from Q9 and Q10
9 (a)
Explain different implementation approaches to DSM.
8 M
9 (b)
What is Data centric consistency model? Explain in detail.
8 M
10 (a)
Explain monotonic reads and monotonic write.
8 M
10 (b)
What is thrashing? Why thrashing is an important issue in DSM systems and what methods are available for dealing with it.
8 M
Answer any one question from Q11 and Q12
11 (a)
What is Byzantine's General problem? Describe Lamport's algorithm to solve this problem.
8 M
11 (b)
Explain following points related to fault tolerance issues in Distributed Systems:
i) Availability
ii) Reliability
iii) Failure Models
iv) Triple modular redundancy
i) Availability
ii) Reliability
iii) Failure Models
iv) Triple modular redundancy
8 M
12 (a)
Explain basic reliable multicasting. How it could be made scalable.
8 M
12 (b)
Draw state transition diagram for Two phase commit protocol and highlight the states where the participant is get blocked. Also mention the drawbacks of 2PC.
8 M
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