The routing protocol that uses both bandwidth and delay to determine the best pathway to reach a remote network is the Border Gateway Protocol (BGP).
What is routing protocol?
A routing protocol outlines the manner in which routers interact with one another to share data that enables them to choose routes between nodes on the a computer network. Data packets are forwarded thru the internet's networks from router to router until those who reach their destination computer. Routers are responsible for traffic directing on the internet. Algorithms for routing choose a specific route. Each router only has prior knowledge of the networks that are directly connected to it. This information is distributed via a routing protocol first to nearby nodes and then throughout the network. In this way, routers learn about the network's topology. What gives the Internet it's own fault tolerance as well as high availability is the capacity of routing protocols to dynamically adapt to changing conditions, such as disabled connections as well as components, and route data around barriers.
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