Provide three specific and contrasting examples of the increasing levels of heterogeneity experienced in contemporary distributed systems.
What will be an ideal response?
Heterogeneity exists in many areas of a contemporary distributed system including in the areas of hardware, operating systems, networks and programming languages. We look at the first three as examples:
• In terms of hardware, distributed systems are increasingly heterogeneous featuring (typically Intel- based) PCs, smart phones, resource-limited sensor nodes, and resource-rich cluster computers or multi- core processors.
• In terms of operating systems, a distributed system may include computers running Windows, MAC OS, various flavours of Unix, and also more specialist operating systems for smart phones or sensor nodes.
• In terms of networks, the Internet is also increasingly heterogeneous embracing wireless technologies and ad hoc styles of networking.
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Unlike a vector, a deque:
a. Provides efficient insertion and deletion only at its front. b. Does not provide indexed access with the subscript operator. c. Is not stored in contiguous memory. d. Cannot store as many different data types.
A user slates that a document is stuck in the print queue. A technician logs on to the computer and tries to delete the document, but the document will not delete and the pnnter has stalled. Which of the following is the NEXT step that the technician should attempt?
A. Restart the print spooler service. B. Remove and re-add the printer. C. Power cycle the printer. D. Reinstall the print drivers.
In most cases, you use a painting tool by selecting it, and then choosing a ____________________ tip.
Fill in the blank(s) with the appropriate word(s).
In the following expression, what is the order of execution of the operators and the result, given A = 4, B = 5, E = 3, G = True, F = True? A * B + 7 > E ^ 3 OR NOT G AND F
a. *, +, >, ^, NOT, AND : Result is True b. AND, NOT, >, ^, *, +, : Result is False c. ^, *, +, >, NOT, AND, OR : Result is True d. ^, *, +, >, NOT, AND, OR : Result is False