Q & A on Record Route Optino and Routing Information Q: >The record route option simply causes intermediate routers to record their >address as the datagram a passes through. Then how does it dynamically update the routing tables is what i want 2 know? Coz' will it obey Djikstra's Shortest-Path Algorithm by default, or how does the dynamic routing take place, there must be someway by which it must understand how to reach the destination. But will it not record the route in the Routing-Table. It has to do it in the Routing-Table, don't you agree? A: The record route option has nothing to do with placing information in routing tables -- the routing tables must be correct BEFORE datagrams can pass through across an internet. Routers use special protocols to exchange routing information and keep the routing tables correct. Examples include: RIP (Routing Information Protocol), OSPF (Open Shortest Path First), and BGP (Border Gateway Protocol). OSPF does indeed use Dijkstra's algorithm; protocols like RIP use the distance-vector algorithm.