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The network layer, in reference to the OSI model, provide
1. data link procedures that provide for the exchange of data via frames that can be sent and received
2. the interface between the X.25 network and packet mode device
3. the virtual circuit interface to packet-switched service
4. all of the above

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Correct Answer - Option 3 : the virtual circuit interface to packet-switched service

Concept:

  • The main aim of this layer is to deliver packets from source to destination across multiple links (networks).
  • For achieving this, network layer establishes a virtual circuit interface to the packet-switched service on which packets load and get transferred.

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