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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.
Differentiate between structured analysis and structured design. The aim of structured analysis is to transform the textual explanation of a problem into a graphic model. Duri
What are the profits of vertical partitioning? i. These are very easy to maintain changes. ii. They decreased the change impact and error propagation.
Define Data Flow Diagram. A Data flow diagram is a graphical description that depicts information flow & the transforms that are applied as data move from input to output. T
What are the umbrella activities of a software process? Software project tracking and control. Risk management. Software Quality Assurance. Formal Technical Reviews.
The process of evaluating a program based on implementation of that program. Dynamic analysis approaches rely on implementing a piece of software with selected test data.
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
1.1 Discuss possible ramifications of these opposing objectives on the project. What would you do if you were the manager?
What are business process engineering tools? By modelling the strategic information requirements of an organization, business process engineering tools provide a "meta-model" f
Mention some of the drawbacks of RAD model. Unuseful for a large-scale projects. Interest of developers & customers are necessary. Not useful and perfect when technica
What are the merits of incremental model? i. The incremental model can be adopted when there is less number of people included in the project. ii. Technical risks can be ma
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