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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. Discuss some of the problems that are faced during maintenance of software? - Habitually another person or group of persons working over the years in isolation from each oth
What is meant by software prototyping? Software prototyping is a process of producing a model for the software product. This is developed based on the recently known requiremen
What are the two levels of testing? i. Component testing Individual works are tested. Tests are derived from developer's experience. ii. System Testing The group o
Explain CASE ?
Problem: (a) Draw an Entity Relationship Diagram for the given case study. Show entities and relationships on the diagram (attributes should not be shown). Cardinality and op
What things will you remember when making an interface? - A class's interface must be sensible enough. It should act the way user expects it to. - It must be designed from t
Define top-down testing. System developed starting from most general modules. Testing begins from the most general module.
Hoosier Burger''s food ordering system dfd and data dictionary
Define software reliability. What is the difference between hardware & software reliability? Ans: Software reliability is the possibility that software will provide failure-f
What are the two levels of testing? i. Component testing Individual components are tested. Tests are derived from developer' s experience. ii. System Testing The group
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