What is an Exchange Point?

• Internet Exchange Point

• Interconnection points of the Internet.

• Places where ISPs come to interconnect with each other.

• “Clearing House” for Internet traffic

• IXPs “Keep local traffic local”

“IXPs are the keystone of the entire Internet economy.”

Cisco Systems

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- NAP viewed as a layer 2 infrastructure to which ISPs attach via routers for traffic exchange.

- NSFnet information available at http://www.merit.edu/nsfnet/internet.html