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An autonomous system (AS) is a collection
of networks under a common administration sharing a common routing
strategy. To the outside world, an AS is viewed as a single entity.
The AS may be run by one or more operators while presenting a
consistent view of routing to the external world. The American Registry of Internet
Numbers (ARIN), a service provider, or an administrator assigns an
identifying number to each AS.
This autonomous system number is a 16 bit number. Routing protocols,
such as Cisco’s IGRP, require assignment of a unique, autonomous
system number.
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