单项选择题
One of the most widely used routing protocols in IP networks is the Routing Information Protocol (RIP). RIP is the canonical example of a routing protocol built on the ______ algorithm. Routing protocols in internetworks differ slightly from the idealized graph model. In an intemetwork, the goal of the routers to forward ______ to various networks.
Routers running RIP send their advertisement about cost every ______ seconds. A router also sends an update message whenever an update from another router causes it to change its routing table.
Routing protocols use different techniques for assigning ______ to individual networks. Further, each routing protocol forms a metric aggregation in a different way. RIP takes the simplest approach, with all link costs being equal ______. Thus it always tries to find the minimum hop route.Valid distances are 1 through 15. This also limits RIP to running on fairly small networks.
A．Dijkstra
B．path-vector
C．link-state
D．distance-vector
