1.
 - a service-independent telecommunications network
   - intelligence in distributed computer nodes
   - (e.g.) it's hard to compete with other companies nowadays without producing
new services rapidly - IN makes that much easier and less expencive
   - examples: area number calling, do-not-disturb, N11, single
 number, routing by time of day etc. (iec IN tutorial, www.iec.org)

2
 requirements:
   - "the major cost is incurred by SSP introduction, as this IN element has to
      be introduced widely and requires CCS7 availability for the switch"
   benefits:
   - "the main benefit of intelligent networks is the ability to
 improve existing services and develop new sources of revenue"
   - introduce new services rapidly
   - service customisation
   - vendor independence
   - open interfaces... etc. (iec IN tutorial, www.iec.org)
   problems:
   - 

3. http://www.item.ntnu.no/~peterc/publ/thesis/2inint.html

   1. Service plane
     - definition of the services that should be supported in a network-independent way
     - identifying the services' basic capabilities which can be combined in
order to build indentified and other services
     - services described from the user's point of view
     - example: free call service, abbreviated dialing, VPN

   2. Global functional plane
     - further decomposition of these service capabilities into smaller
functional blocks (SIBs) in order to achieve some degree of service independence.
     - models the network from a global high-level perspective as a single
programmable entity, hiding the complexity of the distribution of functions.
     - example: charging, call log, service data management

---IN starts here :)

   3. Distributed functional plane
     - the identified basic service capabilities used for the definition of an
IN architecture
     - two stages: first the network entities are defined in terms of functional
elements and their interactions, then these elements are allocated to specific
physical entities.
     - provides transparency to the physical network elements
     - example: call control agent function (user access), call control function
(call/connection accessing and control), service control funtion (commands call
control functions in the processing of IN provided and/or custom service requests)

   4. Physical plane
     - models the physical aspects of an IN-structured network and contains the
real view of the physical network
     - defines different physical entities and their interfaces
     - example: Service Node, Service Switching Point, Intelligent Peripheral 

4. 1. all incorrect
   2. a&c correct, b incorrect
   3. c incorrect, a&b correct
   4. b
   5. a