The defensive perimeter extends out from these fi rst protective devices, to include proactive defense such as boundary routers which can provide early warning of upstreamattacks and threat activitie
Th e security perimeter is the fi rst line of protection between
trusted and untrusted networks. In general, it includes a fi rewall and router that
helps fi lter traffi c. Security perimeters may also include proxies and devices, such
as an intrusion detection system (IDS), to warn of suspicious traffi c. Th e defensive
perimeter extends out from these fi rst protective devices, to include proactive
defense such as boundary routers which can provide early warning of upstream
attacks and threat activities. Page 765.
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