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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.
detail the proactive strategies of risk management
When to Re-Engineer? When the system alter are mostly confined to part of the system then re-engineer that part. When hardware or software support becomes obsolete.
Explain in detail the design concepts Abstraction Data abstraction Functional abstraction •Control abstraction Information hiding •Every module in the s
What is cyclomatic complexity? Cyclomatic complexity is given by McCabe. The general formula to compute cyclomatic complexity is M=V (G)=E - N + 2P Where E-Number of e
How will an engineer assess the safety? The risks linked to a project or product must be identified. The purposes of the project or product must be identified and ranked in im
QUESTION - Time Synchronization (a) Why is computer clock synchronization of paramount importance? Give 2 business scenarios whereby time accuracy is critical? (b) Computers
What is a modular system? A modular system having of well defined manageable units to well defined interfaces between them.
Level 5 (Optimising) Organisation satisfies all the requirements of level-4. This is final level. Organisation at this maturity level is considered almost perfect. At this st
What is the Key Process Areas SEI has associated key process areas(KPAs) with every maturity level. KPA is an indicative measurement of goodness of software engineering functi
Question 1: a) Describe the various activities and or processes related to the development of Information systems. b) Using a diagram, show the several development processes
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