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   5.  CONCEPTUAL MODEL OF A HOST

   This section describes a conceptual model of one possible data
   structure organization that hosts (and to some extent routers) will
   maintain in interacting with neighboring nodes.  The described
   organization is provided to facilitate the explanation of how the
   Neighbor Discovery protocol should behave.  This document does not
   mandate that implementations adhere to this model as long as their
   external behavior is consistent with that described in this document.

   This model is only concerned with the aspects of host behavior
   directly related to Neighbor Discovery.  In particular, it does not
   concern itself with such issues as source address selection or the
   selecting of an outgoing interface on a multihomed host.