Some routing algorithms assume that the source end node will determine the entire route. This is usually referred to as source. In source-routing systems, routers merely act as store-and-forward devices, mindlessly sending the packet to the next stop.
Other algorithm assume that hosts know nothing about routes. In these algorithms, routers determine the path through the internetwork based on their own calculations. In the first system, the hosts have the routing intelligence. In the latter system, routers have the routing intelligence.
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