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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.
Define software reliability. Software reliability is the probability that software will give failure-free operation in a fixed environment for a fixed interval of time. Probabi
Q. How does the risk factor affect the spiral model of software development? Ans: Risk Analysis phase is the most vital part of Spiral Model. In this phase all probable (and
Define sandwich testing. Testing combines the ideas of both bottom-up and top-down testing by defining a certain target layer in the hierarchy of the module. The modules below
FAST stands for :- FAST :- Facilitated Application Specification Technique
Write down any four application of a stack. (i) Conversion of infix to postfix form (ii) Reversing of a line. (iii) Removal of recursion (iv) Evaluating post fix expression
Q. How is cyclomatic complexity useful in program test and What is sequence of testing and What is testability? Ans. Cyclomatic complexity measures the amount of decision lo
"Upwardly compatible software" is software that is compatible with a later or more difficult version of itself. For example, an upwardly compatible software is able to occur files
What is a Real time system? Real time system is a software system in which the correct functionalities of the system are dependent upon results formed by the system and the tim
State Procedural abstraction. A Procedural abstraction is a named series of commands that has a specific and limited function. Eg: Open Walk to the door, reach out & grasp
What are the Problems in comes in SRS There are numerous features which make requirements analysis difficult. These are explained below: 1. Complete requirements are diffic
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