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QUESTION - Fault Tolerance
(a) Three computers together provide a replicated service. The manufacturers claim that each computer has a mean time between failure of five days; a failure typically takes four hours to fix. What is the availability of the replicated service?
(b) In the gossip architecture, why does a replica manager need to keep both a ‘replica' timestamp and a ‘value' timestamp?
(c) Explain the difference between linearizability and sequential consistency, and why the latter is more practical to implement, in general.
(d) Explain why allowing backups to process read operations leads to sequentially consistent rather than linearizable executions in a passive replication system.
What are the principles of testing Below are some of the principles of testing: i) All tests must be performed according to user requirements. ii) Planning of tests m
I have a comprehensive question for Software Metrics ...it is 16 question
What are the three generic phases of software engineering a) Definition, b) development, c) support
Q. Explain Predictive validity? Predictive validity: It is the potential of the model to predict future failure behaviour from present and past failure behaviour. This capabi
Define Behavioral Modelling The state transition diagram represents the behavior of a system by depicting its states and the events that cause the system to change state.
Draw E-R diagram for the following situation An account is a relationship between customer and bank. A customer has a name. A bank has a branch. A customer may have numerous ac
Level 2 (Repeatable) Organisation satisfies all the requirements of level-1. At this stage, basic project management policies and associated procedures are established. Insti
Q. What do you mean by Polymorphism? Polymorphism:- Polymorphism includes the ability to use the same message to objects of different classes and have them behave differently.
State the term- Code Coverage This is an analysis method that determines which parts of software have already been covered by test case suite and which are remaining.
iii. Layered software architectures can be used to reduce coupling between the functions of a system that are closer to the machine and those that are closer to user needs. Why is
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