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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.
Question: a) Discuss which communication method/s you would use in the following situations. Justify your answer. i. Congratulating an employee on obtaining a promotion.
State some guidelines for testing The below are some guidelines for testing: i) Test modules thoroughly, cover all the access paths and produce enough data to cover all the
Gamma testing is testing of software that does have all the needed features, but did not go by all the in-house quality checks.
Q. Explain the concept of bottom-up design? Bottom up design: This approach make possible a style of design where we decide how to combine these modules to provide larger ones
what is meant by phosphate conditiong
Manual testing is the part of software testing that needs operator input, analysis, or evaluation. or A manual testing is a testing for which there is no automation. Instead,
Explain the design principles. The design process should not endure from tunnel vision. The design should be traceable to the analysis model. Design should not re
State about the Data Dictionary This is another tool of requirement analysis that reduces complexity of DFD. A data dictionary is a catalog of all components of a system. DFD
Define software measurement. A software measurement is a procedure or way that applies software measures to a class of software engineering objects to achieve a predefined goa
What are the common activities in design process? i. System structuring - The system is subdivided into principle subsystems components and communications among these subsy
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