Question 4

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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”
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.
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.