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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. Explain COCOMO model with its applicable equations. Describe various attributes of cost drivers used in COCOMO model. Ans. COCOMO denotes for constructive cost model -
What is a boundary value analysis? A boundary value analysis is a testing method in which the elements at the edge of the domain are selected and tested. It is a test case desi
What are the roles of glass-box and black-box testing tools? Glass Box (or white box) testing is the method of giving i/p to the system and checking how the system processes i/
Implementing the program with all possible combinations of values for program variables. Feasible only for small, simple programs.
What is Delphi model? In Delphi method, a number of parameters to be considered based on as experts estimates. The group estimate is taken as on an average of the weighted
system design goals
QUESTION (a) Explain the meaning of the three-tier architecture (b) An Internet banking system can be said to be based on a three-tier architecture. Illustrate this with a d
why srs is also called black box specificaton
What specific languages can be used in SRS? Requirement specification necessitates the use of some order language. The language should support the desired qualities of the SRS-
State Lehman's First law. A program that is used in true world environment essentially must change or become progressively less useful in that environment.
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