Cisy 432:Distributed Systems Question Paper

Cisy 432:Distributed Systems

Course:

Institution: Kenya Methodist University question papers

Exam Year:2011

FACULTY : COMPUTING AND INFORMATICS

DEPARTMENT : CIS AND BIT

TIME : 2 HOURS

INSTRUCTIONS Answer ALL Questions in Section A and TWO Questions in Section B

SECTION A

Question 1

Define the following terms (8Marks)

a) Distributed system

b) Distributed objects

c) Socket

d) Middle ware

Question 2

Describe RMI Software Architecture. (4Marks)

Question 3

State any four challenges in the design of scalable distributed systems. (4Marks)

Question 4

List the main types of distributed system Architectural models. (4Marks)

Question 5

State the function of middle ware and its three components. (4Marks)

Question 6

What are the components of Files Server Architecture (6Marks)

SECTION B

Question 1

a) Discuss about distributed transaction and concurrency control mechanisms that are adapted. (8Marks)

b) Describe the following clock synchronization algorithms : Christian Algorithm , Berkely Algorithms and Network Time protocol . (12Marks)

Question 2

a) Explain the fault tolerance service architecture and gossip architecture (8Marks)

b) Giving examples, describe a distributed multimedia system and explain how QoS is ensured in such a system. (6Marks)

c) Briefly explain how active replication works in regards to fault tolerance and availability. In your answer include an illustration. (6Marks)

Question 3

a) Explain the various types of transparencies in Distributed systems (10Marks)

b) Fault tolerance in distributed systems is closely tied system dependability. (4Marks)

c) Describe three types of failures that may occur in a distributed system. (6Marks)

Question 4

a) With clear examples describe major threats of distributed systems. (10Marks)

b) Describe various security Cryptographic Algorithm that are deployed to counter the threats in Distributed Systems. (10Marks)

Cisy 432:Distributed Systems Question Paper

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