Which three techniques can be used to improve fault isolation in an enterprise network design? (Choose three.)

An OSPF Area Border Router summarizes LSA information between areas, so a topology change inside one area generates a summary prefix change rather than flooding detailed LSAs network-wide, confining the fault's impact to the originating area.

A fully meshed distribution layer provides redundancy and fast failover but does not bound the scope of routing protocol updates or topology change notifications.

Equal-Cost Multipath routing provides load balancing and path redundancy but does not limit how far routing protocol topology changes propagate through the network.

EIGRP queries propagate outward until a feasible successor or a stub boundary is reached; configuring EIGRP stub routers or using route summarization at distribution boundaries limits how far queries travel, preventing a single failure from triggering a network-wide query storm.

IS-IS Level 1 and Level 2 routing creates separate flooding domains; LSPs generated by a topology change within one Level 1 area are not flooded into other areas, so the fault's impact is contained to the local flooding domain.

Tuned STP timers affect how quickly spanning tree converges after a topology change but do not isolate the fault from the rest of the Layer 2 or Layer 3 network.