Internet Routing How It Works Prepared and Presented by the NRO On Behalf of the RIRs AfriNIC, APNIC, ARIN, LACNIC, RIPE NCC

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Definitions Routing The act of moving information across an internetwork from a source to a destination. Domain Name System [DNS] A means of storing and retrieving information about hostnames and IP addresses in a distributed data base.

Point-to-Point Networking Routing – How It WorksGovernment Advisory CommitteeJuly 2005

Point-to-Point Networking Routing – How It WorksGovernment Advisory CommitteeJuly 2005

Point-to-Point Networking Routing – How It WorksGovernment Advisory CommitteeJuly 2005

Point-to-Point Networking Routing – How It WorksGovernment Advisory CommitteeJuly 2005

Point-to-Point Networking Routing – How It WorksGovernment Advisory CommitteeJuly 2005

Point-to-Point Networking Routing – How It WorksGovernment Advisory CommitteeJuly 2005

Point-to-Point Networking Routing – How It WorksGovernment Advisory CommitteeJuly ! / 2! * ((6 – 2)!) = 15n! / p! * ((n – p)!) = c 60 ! / 2! * ((60 – 2)!) = 1, ! / 2! * ((600 – 2)!) = 179,700

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Network

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Inter Connected Networks

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Routed Internetwork

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Using DNS

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Administrative Grouping

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Autonomous Systems AS 1234 AS 2345 AS 3456

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Routing Announcement AS 1234 AS 2345 AS 3456 I speak for and

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Policy Announcement AS 1234 AS 2345 AS 3456 I prefer AS2345 but not AS3456

Routing – How It WorksGovernment Advisory CommitteeJuly 2005 Policy Announcement AS 1234 AS 2345 AS 3456 I refuse AS3456

Routing – How It WorksGovernment Advisory CommitteeJuly 2005