Distributed systems UE Past Papers Questions.

A file server uses caching and achieves a hit rate of 75%. File operations in the server cost 6 ms of CPU time when the server finds the requested block in the cache, and take an additional 12ms of disk I/O time otherwise . Explaining any assumptions you make, estimate the server`s throughput capacity ( average requests/sec) if it is

• Single -threaded
• Two - threaded running on a single processor

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Describe three major roles uses that cryptography plays in the implementation of secure systems

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Explain how secure distributed systems cope with exposed service interfaces and insecure networks in an environment where attackers are likely to have knowledge of the algorithms used and to deploy the computing resources.

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Explain any two ways of invoking a method on a remote object.

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Explain how a distributed system interacts with the operating system.

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