Why "Routing by Rumor" ? ...Much in the way that a blogger learns from information posted by other bloggers, the routers that direct traffic across the Internet largely rely on knowledge passed on to them by their neighboring routers. The class of routing protocols known as Distance-Vector protocols have come to be referred to as "routing by rumor", because a router learns about the available routes to other networks through information passed along to it by neighboring (directly connected) routers. Border Gateway Protocol, or BGP, which is the most commonly used protocol used between the connected networks that make up the Internet, is considered a Distance-Vector protocol.
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