a policy infrastructure is the set of protocols, info models, and
services that allow administrative intentions to be translated into
differential packet treatment of network packet flows
policy
unified regulation of access to network resources \& services based on admin criteria
network view of policy
an intuitive, high-level perspective of topology, connectivity,
end-to-end performance objectives, and dynamic state of the network
different protocols … can be used exchange policy information,
and exchange of policy information among different administrative
domains