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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 virtual memory? Ans) Virtual memory tells to virtual storage. In virtual storage, portions of a user's program and data are placed in auxiliary storage, and the operatin
Q. Why we need restructuring techniques? The restructuring helps in maintaining a program in the following ways: (a) Programs have higher excellence better documentation l
What are the assumptions of the execution-time component model? The execution-time component is based on the several assumptions: (1) Tests show the environment in which the
What are the benefits of smoke testing? Integration risk is decreased. The quality of the end-product is better. Error diagnosis and correction are simplified. Assessment of pr
What is Validation represent? Validation means a set of deeds that ensure that the software that has been built to satisfy the customer requirements.
Peripheral devices are irrelevant to the computer
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 elements of Analysis model? i. Data Dictionary ii. Data Flow Diagram iii. Entity Relationship Diagram iv. State Transition Diagram v. Process specifica
The aim of regression testing is to test that the fixes have not formed any other problems elsewhere. The aim is to ensure the software has remained intact. A baseline set of data
Different levels of CMM: 1) Initial (maturity level 1) 2) Repeatable (maturity level 2) 3) Defined (maturity level 3) 4) Managed (maturity level 4) 5) Optimizing (
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