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Private Network Interface

PNNI is a routing protocol used within for ATM (Asynchronous Transfer Mode) that allows ATM switches to exchange routing information. As such, it enables ATM switches within a network to determine the best route over which to establish a connection. Thus PNNI is similar to other routing protocols such as RIP (Routing Information Protocol) however unlike RIP, it is a source routing protocol rather than a hop by hop protocol.

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