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Chapter 13: Routing and Peering > CONNECTION-ORIENTED AND CONNECTIONLESS NETWOR...

CONNECTION-ORIENTED AND CONNECTIONLESS NETWORKS

Many layers of a protocol stack, especially the lower layers, offer a choice of connection-oriented or connectionless protocols. These choices are often independent. We’ve seen that connectionless IP can use connection-oriented PPP at Layer 2. But what is it that makes a network connectionless? Not surprisingly, it’s the implantation of the network layer. IP, the Internet protocol suite’s network layer protocol, is connectionless, so TCP/IP networks are connectionless.

Connection-oriented networks are sometimes called switched networks, and connectionless networks are often called router-based networks. The signaling protocol messages used on switched networks to set up SVCs are themselves routed between switches in a connectionless manner using globally unique addresses (such as telephone numbers). These call setup messages must be routed, because obviously there are no connection paths to follow yet. Every switched network that offers SVCs must also be a connectionless, router-based network as well.


  

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