router
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... provider to control the traffic that can
traverse through the resources (routers, links) controlled by the
provider ...
... requirement has to be carried by every entity
(e.g., router, host) within an organization that would like to impose
the requirement ...
... requirements in a more or
less central fashion, for example by utilizing just some of the
routers.
Even if the scope of the routing information ...
... and/or destinations, as a packet may be encapsulated by some router
along the path, with the original source and/or destination addresses
...
... addresses assigned to individual entities (e.g.,
hosts, routers) reflect the position of these entities within the
network topology -- addresses ...