A host entity resides in a node in a network. Hosts may be part of
multiple networks at the same time. The identity of the host entity
is independent of its current location(s) in the network. The host’s
locations are determined by the locators of the points of network
attachment it attaches to with specific communication interfaces.
The term host entity does not denote a physical machine – it identifies
a logical entity that may share physical hardware with multiple
other host entities. Chiappa’s concept of an endpoint [2] and
the FARA entity can be seen as similar to host entities. Depending
on interpretation, they can correspond either to host entities or to
points of application attachment.