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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.
What is bottom-up approach? System developed beginning from detailed modules. Testing begins from the detailed modules and proceeds up to the higher levels of hierarchy.
Q. What do you mean by Core dumps? Core dumps are a repairing technique. A printout of all applicable memory locations is obtained and studied. All dumps must be well documente
Describe about the Environmental model It indicates environment in which system exists. Any small or big system is a sub-system of a larger system. For illustration, if softw
What is meant by Throw away Prototyping? Giving the user a system which is incomplete and then augmenting and modifying it so that user requirements become clear. The obj
Describe the various elements of data design? i. Data object - The data objects are identified and relationships among various data objects are represented using ERD or data di
Describe the advantages of proper inheritance. The biggest advantages of proper inheritance are: a.) substitutability and b.) extensibility.
Define the computer based system. The computer based system can be explained as "a set or an arrangement of elements that are organized to accomplish some predefined goal by pr
Question: (a) Differences between programme managers and project managers. (b) A small computer system controls the entry of vehicles to a car park. Each time a vehicle pu
give examples of cohesion and coupling
What are dynamic testing tools? Dynamic testing tools: 1: coverage analyzers (execution verifiers 2: output comparators 3: Test data generators: 4: Test file gen
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