“An autonomous system (AS) is a collection of IP networks and routers under the control of an entity that presents a common routing policy to the Internet ([1], see also [2]). In the Internet [3], an AS is usually a network of a Service Provider (SP), including all customers without their own AS, or a multi-homed end customer connected to multiple SPs.

A transit autonomous system is a network that is passing transit traffic (traffic not originated nor terminated in the network) between remote autonomous systems. A non-transit AS is a network that transports only traffic originating or terminating on an IP host (or server) within the network.”

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