A、Passive routes are in the process of being calculated by DUAL.

B、EIGRP supports VLSM，route summarization，and routing update authentication.

C、EIGRP exchanges full routing table information with neighboring routers with every update.

D、If the feasible successor has a higher advertised distance than the successor route，it becomes theprimary route.

E、A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information.