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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.
Use the Newton divided-di_erence method to construct interpolating polynomials of degree one, two, and three for the following data. Approximate f(0.18) using each of the polynomia
A Software Requirements Specification (SRS) is a complete description of the behavior of the system to be developed. It includes a set of use cases, describing the interactions
Define the computer based system. The computer based system can be explained as "a set or an arrangement of elements that are organized to accomplish some predefined goal by pr
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What is Requirement Traceability? Explain its importance. Requirement Traceability is mapping of needs to test cases. There are two major traceability: Forward and Backward. It
Q. Describe about Unit Testing? Unit Testing: The unit testing is completed to test the individual module of the software. Test cases are designed to test the program functiona
When must you stop testing? It is very difficult to determine as many modern software applications are complex and run in such an interdependent environment that complete testi
Q. Explain about Mutation testing? Mutation testing In mutation testing the software is initial tested by using an preliminary test suite built up from the different white bo
Q. For the structural chart given in fig.1 calculate the Information Flow index of individual modules as well as whole software. Total information flow = IF (main) + IF (A
What is Data Flow Analysis? Ans) Having of the graphical analysis of collections of (sequential) data definitions and reference patterns to verify constraints that can be placed
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