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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.
Enumerate the evolution of software The below Table summarises evolution of software: 1960s Infancy Machine Code 1970s Project Years
Function count:- It measures the functionality from the user point of view, that is, on the basis of what the user requests and receives in return. Therefore it deals with the fun
What are the profits of vertical partitioning? i. These are very easy to maintain changes. ii. They decreased the change impact and error propagation.
QUESTION - Name Services (a) Illustrate with help of a diagram the results of a DNS lookup and an ARP lookup assuming we are using IPv4. (b) Why do DNS root servers hold en
What are the properties of SRS? i. Correct - The SRS must be built up to date while appropriate requirements are identified. ii. Unambiguous - When the requirements are pro
desidn a complete flow chart diagram ,which ask the user to input the rate of diesel and quantity of diesel consumed.after calculate the total amount of diesel consumed and display
Define about the erroneous data - Test data Abnormal/erroneous data - This is data outside the limits of validity/acceptability and must cause an error message to be g
Q. Compare the basic COCOMO model with the detailed COCOMO model. Ans. COCOMO contains of a hierarchy of three increasingly detailed and accurate forms. Basic COCOMO i
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Configuration Management: Because of several reasons, software changes during its life cycle. As a result of the changes made, many versions of the software exist at one time.
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