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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.
Q. Explain throw-away prototyping and evolutionary prototyping. Discuss the differences between the two. Ans Throw-Away Prototyping as well called close ended prototyping .
Distinguish between alpha and beta testing. Alpha and beta testing are the types of acceptance testing. Alpha test: The alpha testing is attesting in which the version o
how do risc factor affect a spiral model of software development
What is Process improvement? Understanding existing processes and introducing process changes to improve product quality, decrease costs or accelerate schedules. Most proces
Test Configuration Managers handles test environments, scripts, software and test data. Depending on the project, single person may wear more than single hat. For example, Test Eng
short note on average manning
Partitioning:- Problems are often too large and difficult to be understood as a whole. For this reason, we tend to partition such difficulties into parts that can be easily unders
Write short note on black box testing. The black box testing is also known as behavioural testing. This method fully focuses on the functional needs of the software. Tests are
Problem: (a) Define measurement and briefly summarize the representation condition for measurement. (b) Software metrics is a term that embraces many activities, all of whi
The sequence of testing is: a) Unit testing: b) Integration testing: Alpha Testing- Beta testing Acceptance Testing
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