IX Routable Protocols and Routing Protocols
Routing protocols are not the same as routable protocols.
When we say that a protocol is routable, we mean that packets in a conversation using that protocol are capable of being sent from one network to another without becoming meaningless. Not all protocols (or protocol suites) are routable.
When we say that a protocol is a routing protocol, we mean that it is directly involved in determining the network path that is used to move the packets in a routable protocol from one network to another. Routing protocols operate at Layer 3 of the OSI model.
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