Each layer offers its services in the form of primitives.  Four
   classes of primitives are defined as shown in Figure 1.  Request is
   issued by the layer that wants to get the services or the information
   from another layer, and Confirm is the acknowledgment of the request.
   Indication is the notification of the information to the layer that
   requested the service, and Response is the acknowledgment of the
   indication.

   -------------------------   -----------------------------
             Request                       Response
               ||      /             /      ||
   Layer N     ||      ||             ||      ||
   ------------||------||---   -------||------||------------
               ||      ||             ||      ||
               /      ||             ||      /
   Layer N-m        Confirm       Indication
   -------------------------   -----------------------------

                Figure 1: Interaction Model between Layers

What is ZigBee?
What is IEEE 802.15.4?
How is ZigBee different from other wireless standards (e.g. Bluetooth)?
What are the real-life applications of ZigBee?
How reliable is the data delivery?
How long is the battery life?
What are the cost considerations for ZigBee implementation?
How long is the Transmission Range?
How high is the Data Rate?
What is the Data Latency for ZigBee Networks?
How large/small a ZigBee Network can be?
How is the Data Security provided?
What is ZigBee Stack?
What Subunits can be on a Node?
What is called ZigBee Application?
What are the ZigBee Device Descriptors?
What is ZigBee Device Profile?
What is ZigBee Stack Profile?
What are the ZigBee Device Objects?
How does a Device/Service Discovery process work?
What are the Clusters, ZigBee Binding and Binding Table?
How is Addressing and Messaging done in a ZigBee network?
What types of ZigBee Devices exist in a network?
What Topologies are supported by ZigBee?
What is ZigBee network Gateway?

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