What data is used by OSPF and ISIS for loop prevention?
- a synchronized map of the network
- hop count to the destination
- autonomous system path to the destination
- feasible distance calculation to the destination
| Answers Explanation & Hints:
OSPF and ISIS are link-state routing protocols. As link-state routing protocols they have a synchronized and identical map of the network. Using the complete map of the network, every router in the network then runs the Dijkstra shortest path first (SPF) algorithm to calculate the best shortest loop-free paths. |