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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 is recovery testing? Recovery testing is a system test that forces the software to fail in a various of ways and verifies that recovery is properly done.
Explain Basis Path Testing? Ans) Basis path testing is a white-box method. It permits the design and definition of a basis set of execution paths. The test cases created from th
User documentation consist descriptions of the functions of a system without reference to how these functions are implemented. Instances are installation guide and reference guide.
QUESTION 1 (a) Suggest how the atomicity of EV1 "Request for estimate" could be improved (b) Document any five events listed above (Tip: state the actor, system agent, input
Q. Explain Iterative Enhancement model? This model incorporates modification in the software based on the analysis of the existing system. As well the complete documentation of
Question: (a) Consider that every software failure can be classified as either • Syntactic, • Semantic, • System crash. Suppose additionally that every system crash fa
What is CASE? CASE tool stands for Computer Aided Software Engineering. Computer Aided Software Engineering tools assist software engineering manages and practitioners in each
Q. Explain the software life cycle model that incorporates risk factor. Ans. The problem with traditional software process models is that they don't deal sufficiently with th
Determine the process of software Coding The input to coding phase is the SDD document. In this stage, design document is coded according to module specification. This phase t
Define the types of Requirements management Requirements management comprises the below processes: 1. Identifying controls and tracking requirements. 2. Checking complete
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