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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.
Explain the process of Black box testing This is applied during the later stage of testing. It enables software developer to derive a set of input conditions which will fully
Q. Why is good design important for a product? Ans: A superior design is the key to successful product. Almost 2000 years previously a Roman Architect recorded the followin
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Build and Fix Model It's a simple two phase model. In one phase, code is developed and in another, code is fixed. Figuredepicts the Build and Fix model.
A computer program is "user friendly", when it is designed with simple of use, as one of the primary purposes of its design.
Distinguish between verification and validation. Verification refers to the set of activities that make sure that software correctly executes a specific function. Validation re
What is software selection?
Explain about the incremental model. Have same phases as the waterfall model. Phases are Analysis. Design. Code. Test. Incremental model deliver
Documentation specifying the scope, approach, resources, and schedule of intended testing activities. It signifies test items, the features to be tested, the testing tasks, respons
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