Which of these dynamic routing protocols are distance-vector based?

EIGRP and RIP are distance-vector routing protocols. Distance-vector protocols determine the best path to a destination based on the "distance" (e.g., hop count, bandwidth, delay) and the "direction" (the next-hop router). RIP uses hop count as its metric. EIGRP is an advanced distance-vector protocol that uses a composite metric including bandwidth, delay, reliability, and load. IS-IS and OSPF are link-state routing protocols, which build a complete topology map of the network before calculating the shortest path. BGP is a path-vector routing protocol, primarily used for inter-domain routing on the internet, focusing on paths and policies rather than just distance.