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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.
Enumerate the evolution of software The below Table summarises evolution of software: 1960s Infancy Machine Code 1970s Project Years
You need to test a system though there is no documentation available and developers who developed it don't work there anymore. What would you do? - We will perform exploratory
Q Distinguish software faults and software failures? Ans: In case of a failure a software doesn't do what the users expect, a fault is a programming bug that may or mayn't act
what is behavioral modelling?
give examples of cohesion and coupling
RAD Model Rapid Application Development Model is the part of incremental model. Achieves the high speed development using component based construction. Phases
Q. What is Unit testing explain ? Unit testing: Unit testing is undertaken after a module has been coded and successfully reviewed. Unit testing (or module testing) is the te
what is software process model and waterfall model?
What problems arise if two modules have high coupling? Coupling means the interconnection of dissimilar modules with each other or we can say, it tells about the interrelations
What is Software metric? Any type of measurement which relate to a software system, process or related documentation Lines of code in a program, the Fog index, number of
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