A.console password
B.vty password
C.aux password
D.tty password
E.enable secret password
F.username password

A.It provides dynamic neighbor discovery.
B.It detects unreachable neighbors in 90 second intervals.
C.It maintains neighbor relationships.
D.It negotiates correctness parameters between neighboring interfaces.
E.It uses timers to elect the router with the fastest links as the designated router.
F.It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF