Rr410502 Distributed Sytems

8/9/2019 Rr410502 Distributed Sytems

http://slidepdf.com/reader/full/rr410502-distributed-sytems 1/4

Seminar Topics - Scholarships - Admission/Entrance Exam Notifications

USA-UK-Australia-Germany-France-NewZealand Universities List

Engineering-MBA-MCA-Medical-Pharmacy-B.Ed-Law Colleges Information

www.andhracolleges.com The Complete Information About Colleges in Andhra Pradesh

www.andhracolleges.com

Code No: RR410502 Set No. 1

IV B.Tech I Semester Regular Examinations, November 2007DISTRIBUTED SYTEMS

( Common to Computer Science & Engineering and Electronics &Computer Engineering)

Time: 3 hours Max Marks: 80Answer any FIVE Questions

All Questions carry equal marks⋆ ⋆ ⋆ ⋆ ⋆

1. (a) Define concurrency and parallelism. What opportunities for parallelism arisein distributed client-server systems?

(b) How can the design of a distributed system ensure that it will be scalable?[4+4+8]

2. Compare and explain times for Synchronous and Asynchronous Remote ProcedureCalls with suitable diagrams. [8+8]

3. (a) Explain the advantage of copy-on-write region copying for UNIX, where a callto fork is typically followed by a call to exec.

(b) What should happen if a region that has been copied using copy-on-write isitself copied? [8+8]

4. Explain about logical time and logical clocks. [8+8]

5. Explain how the conversation takes place between a client and a server in detail.[16]

6. Explain about two-phase commit protocol for nested transaction. [16]

7. Explain log for banking service with relevant diagram. [10+6]

8. Summarize the abstractions provided by the Mach Kernel in detail. [16]

⋆ ⋆ ⋆ ⋆ ⋆

1 of 1













1. Draw the diagrams of Distributed System with its components based on local net-work and centralized multi user system. Distinguish them. [8+8]

2. (a) What are multicast messages? Where is it implemented? And what are thecharacteristics of it?

(b) Explain about with respect to Group Communication:

i. Atomicity

ii. Ordering. [2+2+4+4+4]

3. (a) Can a server invoked by light weight procedure calls control the degree of concurrency within it? Explain.

(b) Explain why and how a client is prevented from calling arbitrary code within

a server under lightweight RPC. [8+8]

4. Explain Cristian’s method for Synchronising clocks. [16]

5. (a) Explain backward validation and forward validation.

(b) Compare forward and backward validation and explain about starvation.[8+8]

6. What are the operations for the two phase commit protocol? Explain with a dia-gram. [10+6]

7. What are various characteristics of faults. [16]


⋆ ⋆ ⋆ ⋆ ⋆

1 of 1













1. (a) Are shared memory multiprocessors distributed systems? Explain

(b) Contrast the problems of implementing process migration between work sta-

tions and between processors within a shared memory multiprocessor.[2+6+4+4]

2. (a) What are three protocols involved in RPC Exchange Protocols? Explain.

(b) Explain about the following:

i. an Idempotent Operation

ii. Multipacket messages. [2+6+4+4]

3. Why should UFIDs be unique across all possible file systems? How is uniquenessfor UFIDs ensured? [8+8]

4. (a) Explain the central server algorithm.

(b) Explain distributed algorithm using logical clocks. [8+8]

5. (a) Explain backward validation and forward validation.

(b) Compare forward and backward validation and explain about starvation.[8+8]

6. How the virtual partitions are implemented ? [16]

7. Explain about Needham- Schroeder secret key authentication protocol. [16]

8. Discuss design and implementation issues of Distributed-Shared memory. [16]

⋆ ⋆ ⋆ ⋆ ⋆

1 of 1













1. Draw the diagrams of Distributed System with its components based on local net-work and centralized multi user system. Distinguish them. [8+8]

2. Compare and explain times for Synchronous and Asynchronous Remote ProcedureCalls with suitable diagrams. [8+8]

3. Draw and explain NFS software architecture. [6+10]

4. Explain the following.

(a) Clock drift

(b) Coordinated Universal Time. [8+8]

5. Explain ACID properties and how the transaction are failure and how they are

recovered ? [16]

6. Explain the architecture for replicated transactions. [16]

7. Explain various methods of attacking and defenses. [16]


⋆ ⋆ ⋆ ⋆ ⋆

1 of 1

Rr410502 Distributed Sytems

Documents

Transcript of Rr410502 Distributed Sytems