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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 Iterative Enhancement model Iterative Enhancement model: This model incorporates alters in the software based on the analysis of the existing system. Also the complet
Define the Design phase of SDLC In this stage, a logical system is built which fulfils given requirements. Design phase of software development deals with transforming custome
Give explanation about the software testing strategies. A strategic approach to software testing. Verification and Validation. Verification means a set of work o
Write short notes on empirical estimation models. Estimation model for computer software uses empirically derived formulas to assume effort as a function of line of codes (LOC)
What are the approaches of integration testing? The integration testing may be performed using two approaches. 1. The non-incremental testing. 2. Incremental testing.
Explain exploratory testing. - In exploratory testing approach testers are included in minimum planning and maximum test execution. - The planning contains creation of a tes
Draw a memory map for a system with a memory capacity of 256MB. Each memory location in the system is 8 bits. Assume the system has one 4 MB memory block used as ROM residing at th
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What are the various testing activities? i. Test planning ii. Test case design iii. Data collection iv. Test execution v. Effective evaluation
Q. Who is a stake holder for a software project? [Stake holder :- something or somebody with direct interest: a group or person with a direct interest, investment or involvem
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