Question 4

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Author:
abdul123
ID:
216559
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Question 4
Updated:
2013-04-29 11:41:45
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ccm
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exam
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  1. A) Describe the iterative and recursive DNS name
    resolution. Provide also an example. For instance show
    how the www.google.com name can be resolved.
    nrecursive query:

    • puts burden of name
    • resolution on contacted name server

    heavy load?

    niterative query:

    • contacted server
    • replies with name of server to contact

    • “I don’t know this name,
    • but ask this server”
  2. B) Why is it useful to define interfaces?
    • 1.from a software-engineering point of view,
    • having precise and unambiguous interface definitions is important for
    • understanding and maintaining objects.

    • 2.IDL-based definitions come in handy for
    • generating stubs.
  3. C) Does a stateless server need to take checkpoints?
    • Checkpointing is a technique for
    • inserting fault tolerance into computing systems. It basically consists of
    • storing a snapshot of the current application state, and later on, use it for
    • restarting the execution in case of failure.

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